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Vulnerability Details :

CVE-2021-23981

Summary
Assigner-mozilla
Assigner Org ID-f16b083a-5664-49f3-a51e-8d479e5ed7fe
Published At-31 Mar, 2021 | 13:42
Updated At-03 Aug, 2024 | 19:14
Rejected At-
Credits

A texture upload of a Pixel Buffer Object could have confused the WebGL code to skip binding the buffer used to unpack it, resulting in memory corruption and a potentially exploitable information leak or crash. This vulnerability affects Firefox ESR < 78.9, Firefox < 87, and Thunderbird < 78.9.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:mozilla
Assigner Org ID:f16b083a-5664-49f3-a51e-8d479e5ed7fe
Published At:31 Mar, 2021 | 13:42
Updated At:03 Aug, 2024 | 19:14
Rejected At:
▼CVE Numbering Authority (CNA)

A texture upload of a Pixel Buffer Object could have confused the WebGL code to skip binding the buffer used to unpack it, resulting in memory corruption and a potentially exploitable information leak or crash. This vulnerability affects Firefox ESR < 78.9, Firefox < 87, and Thunderbird < 78.9.

Affected Products
Vendor
Mozilla CorporationMozilla
Product
Firefox ESR
Versions
Affected
  • From unspecified before 78.9 (custom)
Vendor
Mozilla CorporationMozilla
Product
Firefox
Versions
Affected
  • From unspecified before 87 (custom)
Vendor
Mozilla CorporationMozilla
Product
Thunderbird
Versions
Affected
  • From unspecified before 78.9 (custom)
Problem Types
TypeCWE IDDescription
textN/ATexture upload into an unbound backing buffer resulted in an out-of-bound read
Type: text
CWE ID: N/A
Description: Texture upload into an unbound backing buffer resulted in an out-of-bound read
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
https://www.mozilla.org/security/advisories/mfsa2021-10/
x_refsource_MISC
https://www.mozilla.org/security/advisories/mfsa2021-12/
x_refsource_MISC
https://www.mozilla.org/security/advisories/mfsa2021-11/
x_refsource_MISC
https://bugzilla.mozilla.org/show_bug.cgi?id=1692832
x_refsource_MISC
Hyperlink: https://www.mozilla.org/security/advisories/mfsa2021-10/
Resource:
x_refsource_MISC
Hyperlink: https://www.mozilla.org/security/advisories/mfsa2021-12/
Resource:
x_refsource_MISC
Hyperlink: https://www.mozilla.org/security/advisories/mfsa2021-11/
Resource:
x_refsource_MISC
Hyperlink: https://bugzilla.mozilla.org/show_bug.cgi?id=1692832
Resource:
x_refsource_MISC
▼Authorized Data Publishers (ADP)
CVE Program Container
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
https://www.mozilla.org/security/advisories/mfsa2021-10/
x_refsource_MISC
x_transferred
https://www.mozilla.org/security/advisories/mfsa2021-12/
x_refsource_MISC
x_transferred
https://www.mozilla.org/security/advisories/mfsa2021-11/
x_refsource_MISC
x_transferred
https://bugzilla.mozilla.org/show_bug.cgi?id=1692832
x_refsource_MISC
x_transferred
Hyperlink: https://www.mozilla.org/security/advisories/mfsa2021-10/
Resource:
x_refsource_MISC
x_transferred
Hyperlink: https://www.mozilla.org/security/advisories/mfsa2021-12/
Resource:
x_refsource_MISC
x_transferred
Hyperlink: https://www.mozilla.org/security/advisories/mfsa2021-11/
Resource:
x_refsource_MISC
x_transferred
Hyperlink: https://bugzilla.mozilla.org/show_bug.cgi?id=1692832
Resource:
x_refsource_MISC
x_transferred
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:security@mozilla.org
Published At:31 Mar, 2021 | 14:15
Updated At:03 May, 2022 | 16:04

A texture upload of a Pixel Buffer Object could have confused the WebGL code to skip binding the buffer used to unpack it, resulting in memory corruption and a potentially exploitable information leak or crash. This vulnerability affects Firefox ESR < 78.9, Firefox < 87, and Thunderbird < 78.9.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Primary3.18.1HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
Primary2.05.8MEDIUM
AV:N/AC:M/Au:N/C:P/I:N/A:P
Type: Primary
Version: 3.1
Base score: 8.1
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
Type: Primary
Version: 2.0
Base score: 5.8
Base severity: MEDIUM
Vector:
AV:N/AC:M/Au:N/C:P/I:N/A:P
CPE Matches

Mozilla Corporation
mozilla
>>firefox>>Versions before 87.0(exclusive)
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
Mozilla Corporation
mozilla
>>firefox_esr>>Versions before 78.9(exclusive)
cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*
Mozilla Corporation
mozilla
>>thunderbird>>Versions before 78.9(exclusive)
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
Weaknesses
CWE IDTypeSource
CWE-787Primarynvd@nist.gov
CWE ID: CWE-787
Type: Primary
Source: nvd@nist.gov
Evaluator Description

Evaluator Impact

Evaluator Solution

Vendor Statements

References
HyperlinkSourceResource
https://bugzilla.mozilla.org/show_bug.cgi?id=1692832security@mozilla.org
Issue Tracking
https://www.mozilla.org/security/advisories/mfsa2021-10/security@mozilla.org
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2021-11/security@mozilla.org
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2021-12/security@mozilla.org
Vendor Advisory
Hyperlink: https://bugzilla.mozilla.org/show_bug.cgi?id=1692832
Source: security@mozilla.org
Resource:
Issue Tracking
Hyperlink: https://www.mozilla.org/security/advisories/mfsa2021-10/
Source: security@mozilla.org
Resource:
Vendor Advisory
Hyperlink: https://www.mozilla.org/security/advisories/mfsa2021-11/
Source: security@mozilla.org
Resource:
Vendor Advisory
Hyperlink: https://www.mozilla.org/security/advisories/mfsa2021-12/
Source: security@mozilla.org
Resource:
Vendor Advisory

Change History

0
Information is not available yet

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Vendor-Mozilla Corporation
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Matching Score-6
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Matching Score-6
Assigner-Mozilla Corporation
CVSS Score-8.8||HIGH
EPSS-2.41% / 82.40%
||
7 Day CHG~0.00%
Published-11 Jun, 2018 | 21:00
Updated-25 Nov, 2025 | 17:50
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

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Action-Not Available
Vendor-silMozilla CorporationDebian GNU/LinuxRed Hat, Inc.
Product-graphite2thunderbirdfirefoxenterprise_linuxenterprise_linux_desktopenterprise_linux_serverdebian_linuxenterprise_linux_server_eusenterprise_linux_workstationenterprise_linux_server_ausThunderbirdFirefox ESRFirefox
CWE ID-CWE-787
Out-of-bounds Write
CVE-2023-29551
Matching Score-6
Assigner-Mozilla Corporation
ShareView Details
Matching Score-6
Assigner-Mozilla Corporation
CVSS Score-8.8||HIGH
EPSS-0.52% / 41.12%
||
7 Day CHG~0.00%
Published-02 Jun, 2023 | 00:00
Updated-08 Jan, 2025 | 22:15
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

Memory safety bugs present in Firefox 111. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox for Android < 112, Firefox < 112, and Focus for Android < 112.

Action-Not Available
Vendor-Mozilla Corporation
Product-firefoxfocusFirefoxFocus for AndroidFirefox for Android
CWE ID-CWE-787
Out-of-bounds Write
CVE-2019-11735
Matching Score-6
Assigner-Mozilla Corporation
ShareView Details
Matching Score-6
Assigner-Mozilla Corporation
CVSS Score-8.8||HIGH
EPSS-1.18% / 64.38%
||
7 Day CHG~0.00%
Published-27 Sep, 2019 | 17:21
Updated-04 Aug, 2024 | 23:03
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

Mozilla developers and community members reported memory safety bugs present in Firefox 68 and Firefox ESR 68. Some of these bugs showed evidence of memory corruption and we presume that with enough effort that some of these could be exploited to run arbitrary code. This vulnerability affects Firefox < 69 and Firefox ESR < 68.1.

Action-Not Available
Vendor-openSUSEMozilla Corporation
Product-firefoxfirefox_esrleapFirefoxFirefox ESR
CWE ID-CWE-787
Out-of-bounds Write
CVE-2023-29531
Matching Score-6
Assigner-Mozilla Corporation
ShareView Details
Matching Score-6
Assigner-Mozilla Corporation
CVSS Score-9.8||CRITICAL
EPSS-0.97% / 58.39%
||
7 Day CHG~0.00%
Published-19 Jun, 2023 | 09:48
Updated-11 Dec, 2024 | 16:15
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

An attacker could have caused an out of bounds memory access using WebGL APIs, leading to memory corruption and a potentially exploitable crash. *This bug only affects Firefox and Thunderbird for macOS. Other operating systems are unaffected.* This vulnerability affects Firefox < 112, Firefox ESR < 102.10, and Thunderbird < 102.10.

Action-Not Available
Vendor-Mozilla CorporationApple Inc.
Product-firefoxthunderbirdmacosfirefox_esrFirefoxFirefox ESRThunderbird
CWE ID-CWE-787
Out-of-bounds Write
CVE-2020-12395
Matching Score-6
Assigner-Mozilla Corporation
ShareView Details
Matching Score-6
Assigner-Mozilla Corporation
CVSS Score-9.8||CRITICAL
EPSS-2.26% / 81.14%
||
7 Day CHG~0.00%
Published-26 May, 2020 | 16:58
Updated-04 Aug, 2024 | 11:56
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

Mozilla developers and community members reported memory safety bugs present in Firefox 75 and Firefox ESR 68.7. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox ESR < 68.8, Firefox < 76, and Thunderbird < 68.8.0.

Action-Not Available
Vendor-Mozilla CorporationCanonical Ltd.
Product-firefoxubuntu_linuxthunderbirdfirefox_esrFirefoxFirefox ESRThunderbird
CWE ID-CWE-787
Out-of-bounds Write
CVE-2025-1938
Matching Score-6
Assigner-Mozilla Corporation
ShareView Details
Matching Score-6
Assigner-Mozilla Corporation
CVSS Score-6.5||MEDIUM
EPSS-0.31% / 23.41%
||
7 Day CHG~0.00%
Published-04 Mar, 2025 | 13:31
Updated-13 Apr, 2026 | 15:16
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Memory safety bugs fixed in Firefox 136, Thunderbird 136, Firefox ESR 128.8, and Thunderbird 128.8

Memory safety bugs present in Firefox 135, Thunderbird 135, Firefox ESR 128.7, and Thunderbird 128.7. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 136, Firefox ESR 128.8, Thunderbird 136, and Thunderbird 128.8.

Action-Not Available
Vendor-Mozilla Corporation
Product-firefoxthunderbirdThunderbirdFirefox
CWE ID-CWE-787
Out-of-bounds Write
CVE-2021-29970
Matching Score-6
Assigner-Mozilla Corporation
ShareView Details
Matching Score-6
Assigner-Mozilla Corporation
CVSS Score-8.8||HIGH
EPSS-1.43% / 70.19%
||
7 Day CHG~0.00%
Published-05 Aug, 2021 | 19:46
Updated-03 Aug, 2024 | 22:24
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

A malicious webpage could have triggered a use-after-free, memory corruption, and a potentially exploitable crash. *This bug could only be triggered when accessibility was enabled.*. This vulnerability affects Thunderbird < 78.12, Firefox ESR < 78.12, and Firefox < 90.

Action-Not Available
Vendor-Mozilla Corporation
Product-firefoxthunderbirdfirefox_esrThunderbirdFirefox ESRFirefox
CWE ID-CWE-416
Use After Free
CWE ID-CWE-787
Out-of-bounds Write
CVE-2021-29966
Matching Score-6
Assigner-Mozilla Corporation
ShareView Details
Matching Score-6
Assigner-Mozilla Corporation
CVSS Score-8.8||HIGH
EPSS-1.01% / 59.60%
||
7 Day CHG~0.00%
Published-24 Jun, 2021 | 13:14
Updated-03 Aug, 2024 | 22:24
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

Mozilla developers reported memory safety bugs present in Firefox 88. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 89.

Action-Not Available
Vendor-Mozilla Corporation
Product-firefoxFirefox
CWE ID-CWE-787
Out-of-bounds Write
CVE-2021-29947
Matching Score-6
Assigner-Mozilla Corporation
ShareView Details
Matching Score-6
Assigner-Mozilla Corporation
CVSS Score-8.8||HIGH
EPSS-0.87% / 54.95%
||
7 Day CHG~0.00%
Published-24 Jun, 2021 | 13:19
Updated-03 Aug, 2024 | 22:18
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

Mozilla developers and community members reported memory safety bugs present in Firefox 87. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 88.

Action-Not Available
Vendor-Mozilla Corporation
Product-firefoxFirefox
CWE ID-CWE-787
Out-of-bounds Write
CVE-2021-29967
Matching Score-6
Assigner-Mozilla Corporation
ShareView Details
Matching Score-6
Assigner-Mozilla Corporation
CVSS Score-8.8||HIGH
EPSS-1.37% / 68.98%
||
7 Day CHG~0.00%
Published-24 Jun, 2021 | 13:14
Updated-03 Aug, 2024 | 22:24
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

Mozilla developers reported memory safety bugs present in Firefox 88 and Firefox ESR 78.11. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Thunderbird < 78.11, Firefox < 89, and Firefox ESR < 78.11.

Action-Not Available
Vendor-Mozilla Corporation
Product-firefoxthunderbirdfirefox_esrThunderbirdFirefox ESRFirefox
CWE ID-CWE-787
Out-of-bounds Write
CVE-2021-29988
Matching Score-6
Assigner-Mozilla Corporation
ShareView Details
Matching Score-6
Assigner-Mozilla Corporation
CVSS Score-8.8||HIGH
EPSS-1.39% / 69.37%
||
7 Day CHG~0.00%
Published-17 Aug, 2021 | 19:12
Updated-03 Aug, 2024 | 22:24
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

Firefox incorrectly treated an inline list-item element as a block element, resulting in an out of bounds read or memory corruption, and a potentially exploitable crash. This vulnerability affects Thunderbird < 78.13, Thunderbird < 91, Firefox ESR < 78.13, and Firefox < 91.

Action-Not Available
Vendor-Mozilla Corporation
Product-firefoxthunderbirdfirefox_esrThunderbirdFirefox ESRFirefox
CWE ID-CWE-787
Out-of-bounds Write
CWE ID-CWE-125
Out-of-bounds Read
CVE-2021-29977
Matching Score-6
Assigner-Mozilla Corporation
ShareView Details
Matching Score-6
Assigner-Mozilla Corporation
CVSS Score-8.8||HIGH
EPSS-1.01% / 59.44%
||
7 Day CHG~0.00%
Published-05 Aug, 2021 | 19:46
Updated-03 Aug, 2024 | 22:24
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

Mozilla developers reported memory safety bugs present in Firefox 89. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 90.

Action-Not Available
Vendor-Mozilla Corporation
Product-firefoxFirefox
CWE ID-CWE-787
Out-of-bounds Write
CVE-2021-29990
Matching Score-6
Assigner-Mozilla Corporation
ShareView Details
Matching Score-6
Assigner-Mozilla Corporation
CVSS Score-8.8||HIGH
EPSS-1.01% / 59.44%
||
7 Day CHG~0.00%
Published-17 Aug, 2021 | 19:12
Updated-03 Aug, 2024 | 22:24
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

Mozilla developers and community members reported memory safety bugs present in Firefox 90. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 91.

Action-Not Available
Vendor-Mozilla Corporation
Product-firefoxFirefox
CWE ID-CWE-787
Out-of-bounds Write
CVE-2021-29976
Matching Score-6
Assigner-Mozilla Corporation
ShareView Details
Matching Score-6
Assigner-Mozilla Corporation
CVSS Score-8.8||HIGH
EPSS-1.22% / 65.61%
||
7 Day CHG~0.00%
Published-05 Aug, 2021 | 19:46
Updated-03 Aug, 2024 | 22:24
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

Mozilla developers reported memory safety bugs present in code shared between Firefox and Thunderbird. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Thunderbird < 78.12, Firefox ESR < 78.12, and Firefox < 90.

Action-Not Available
Vendor-Mozilla Corporation
Product-firefoxthunderbirdfirefox_esrThunderbirdFirefox ESRFirefox
CWE ID-CWE-787
Out-of-bounds Write
CVE-2021-43529
Matching Score-6
Assigner-Mozilla Corporation
ShareView Details
Matching Score-6
Assigner-Mozilla Corporation
CVSS Score-9.8||CRITICAL
EPSS-0.47% / 37.89%
||
7 Day CHG~0.00%
Published-16 Feb, 2023 | 00:00
Updated-19 Mar, 2025 | 15:15
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

Thunderbird versions prior to 91.3.0 are vulnerable to the heap overflow described in CVE-2021-43527 when processing S/MIME messages. Thunderbird versions 91.3.0 and later will not call the vulnerable code when processing S/MIME messages that contain certificates with DER-encoded DSA or RSA-PSS signatures.

Action-Not Available
Vendor-Mozilla Corporation
Product-thunderbirdThunderbird
CWE ID-CWE-787
Out-of-bounds Write
CVE-2016-5270
Matching Score-6
Assigner-Mozilla Corporation
ShareView Details
Matching Score-6
Assigner-Mozilla Corporation
CVSS Score-9.8||CRITICAL
EPSS-3.93% / 89.28%
||
7 Day CHG~0.00%
Published-22 Sep, 2016 | 22:00
Updated-06 May, 2026 | 22:30
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

Heap-based buffer overflow in the nsCaseTransformTextRunFactory::TransformString function in Mozilla Firefox before 49.0, Firefox ESR 45.x before 45.4, and Thunderbird < 45.4 allows remote attackers to cause a denial of service (boolean out-of-bounds write) or possibly have unspecified other impact via Unicode characters that are mishandled during text conversion.

Action-Not Available
Vendor-n/aMozilla Corporation
Product-firefoxn/a
CWE ID-CWE-119
Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE ID-CWE-787
Out-of-bounds Write
CVE-2021-23965
Matching Score-6
Assigner-Mozilla Corporation
ShareView Details
Matching Score-6
Assigner-Mozilla Corporation
CVSS Score-8.8||HIGH
EPSS-0.97% / 58.34%
||
7 Day CHG~0.00%
Published-26 Feb, 2021 | 15:28
Updated-03 Aug, 2024 | 19:14
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

Mozilla developers reported memory safety bugs present in Firefox 84. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 85.

Action-Not Available
Vendor-Mozilla Corporation
Product-firefoxFirefox
CWE ID-CWE-787
Out-of-bounds Write
CVE-2021-23979
Matching Score-6
Assigner-Mozilla Corporation
ShareView Details
Matching Score-6
Assigner-Mozilla Corporation
CVSS Score-8.8||HIGH
EPSS-0.92% / 56.72%
||
7 Day CHG~0.00%
Published-26 Feb, 2021 | 15:28
Updated-03 Aug, 2024 | 19:14
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

Mozilla developers reported memory safety bugs present in Firefox 85. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 86.

Action-Not Available
Vendor-Mozilla Corporation
Product-firefoxFirefox
CWE ID-CWE-787
Out-of-bounds Write
CVE-2021-23987
Matching Score-6
Assigner-Mozilla Corporation
ShareView Details
Matching Score-6
Assigner-Mozilla Corporation
CVSS Score-8.8||HIGH
EPSS-1.40% / 69.74%
||
7 Day CHG~0.00%
Published-31 Mar, 2021 | 13:40
Updated-03 Aug, 2024 | 19:14
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

Mozilla developers and community members reported memory safety bugs present in Firefox 86 and Firefox ESR 78.8. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox ESR < 78.9, Firefox < 87, and Thunderbird < 78.9.

Action-Not Available
Vendor-Mozilla Corporation
Product-firefoxthunderbirdfirefox_esrFirefoxFirefox ESRThunderbird
CWE ID-CWE-787
Out-of-bounds Write
CVE-2021-23983
Matching Score-6
Assigner-Mozilla Corporation
ShareView Details
Matching Score-6
Assigner-Mozilla Corporation
CVSS Score-6.5||MEDIUM
EPSS-0.74% / 50.65%
||
7 Day CHG~0.00%
Published-31 Mar, 2021 | 13:41
Updated-03 Aug, 2024 | 19:14
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

By causing a transition on a parent node by removing a CSS rule, an invalid property for a marker could have been applied, resulting in memory corruption and a potentially exploitable crash. This vulnerability affects Firefox < 87.

Action-Not Available
Vendor-Mozilla Corporation
Product-firefoxFirefox
CWE ID-CWE-787
Out-of-bounds Write
CVE-2021-23988
Matching Score-6
Assigner-Mozilla Corporation
ShareView Details
Matching Score-6
Assigner-Mozilla Corporation
CVSS Score-8.8||HIGH
EPSS-1.08% / 61.66%
||
7 Day CHG~0.00%
Published-31 Mar, 2021 | 13:40
Updated-03 Aug, 2024 | 19:14
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

Mozilla developers reported memory safety bugs present in Firefox 86. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 87.

Action-Not Available
Vendor-Mozilla Corporation
Product-firefoxFirefox
CWE ID-CWE-787
Out-of-bounds Write
CVE-2023-28176
Matching Score-6
Assigner-Mozilla Corporation
ShareView Details
Matching Score-6
Assigner-Mozilla Corporation
CVSS Score-8.8||HIGH
EPSS-0.71% / 49.83%
||
7 Day CHG~0.00%
Published-02 Jun, 2023 | 00:00
Updated-08 Jan, 2025 | 21:15
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

Memory safety bugs present in Firefox 110 and Firefox ESR 102.8. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 111, Firefox ESR < 102.9, and Thunderbird < 102.9.

Action-Not Available
Vendor-Mozilla Corporation
Product-firefoxthunderbirdfirefox_esrFirefoxFirefox ESRThunderbird
CWE ID-CWE-787
Out-of-bounds Write
CVE-2025-1414
Matching Score-6
Assigner-Mozilla Corporation
ShareView Details
Matching Score-6
Assigner-Mozilla Corporation
CVSS Score-6.5||MEDIUM
EPSS-0.45% / 36.59%
||
7 Day CHG+0.01%
Published-18 Feb, 2025 | 13:39
Updated-13 Apr, 2026 | 15:16
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Memory safety bugs fixed in Firefox 135.0.1

Memory safety bugs present in Firefox 135. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 135.0.1.

Action-Not Available
Vendor-Mozilla Corporation
Product-firefoxFirefox
CWE ID-CWE-787
Out-of-bounds Write
CVE-2020-6825
Matching Score-6
Assigner-Mozilla Corporation
ShareView Details
Matching Score-6
Assigner-Mozilla Corporation
CVSS Score-9.8||CRITICAL
EPSS-1.91% / 77.58%
||
7 Day CHG~0.00%
Published-24 Apr, 2020 | 15:50
Updated-04 Aug, 2024 | 09:11
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

Mozilla developers and community members Tyson Smith and Christian Holler reported memory safety bugs present in Firefox 74 and Firefox ESR 68.6. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Thunderbird < 68.7.0, Firefox ESR < 68.7, and Firefox < 75.

Action-Not Available
Vendor-Mozilla Corporation
Product-firefoxthunderbirdfirefox_esrThunderbirdFirefox ESRFirefox
CWE ID-CWE-787
Out-of-bounds Write
CVE-2025-14332
Matching Score-6
Assigner-Mozilla Corporation
ShareView Details
Matching Score-6
Assigner-Mozilla Corporation
CVSS Score-7.3||HIGH
EPSS-0.27% / 18.88%
||
7 Day CHG~0.00%
Published-09 Dec, 2025 | 13:38
Updated-13 Apr, 2026 | 15:16
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Memory safety bugs fixed in Firefox 146 and Thunderbird 146

Memory safety bugs present in Firefox 145 and Thunderbird 145. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 146 and Thunderbird 146.

Action-Not Available
Vendor-Mozilla Corporation
Product-firefoxthunderbirdThunderbirdFirefox
CWE ID-CWE-787
Out-of-bounds Write
CVE-2025-14333
Matching Score-6
Assigner-Mozilla Corporation
ShareView Details
Matching Score-6
Assigner-Mozilla Corporation
CVSS Score-8.1||HIGH
EPSS-0.38% / 30.84%
||
7 Day CHG~0.00%
Published-09 Dec, 2025 | 13:38
Updated-13 Apr, 2026 | 15:16
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Memory safety bugs fixed in Firefox ESR 140.6, Thunderbird ESR 140.6, Firefox 146 and Thunderbird 146

Memory safety bugs present in Firefox ESR 140.5, Thunderbird ESR 140.5, Firefox 145 and Thunderbird 145. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 146, Firefox ESR 140.6, Thunderbird 146, and Thunderbird 140.6.

Action-Not Available
Vendor-Mozilla Corporation
Product-firefoxthunderbirdThunderbirdFirefox
CWE ID-CWE-119
Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE ID-CWE-787
Out-of-bounds Write
CVE-2020-6796
Matching Score-6
Assigner-Mozilla Corporation
ShareView Details
Matching Score-6
Assigner-Mozilla Corporation
CVSS Score-8.8||HIGH
EPSS-1.59% / 73.11%
||
7 Day CHG+0.04%
Published-02 Mar, 2020 | 04:05
Updated-04 Aug, 2024 | 09:11
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

A content process could have modified shared memory relating to crash reporting information, crash itself, and cause an out-of-bound write. This could have caused memory corruption and a potentially exploitable crash. This vulnerability affects Firefox < 73 and Firefox < ESR68.5.

Action-Not Available
Vendor-Mozilla Corporation
Product-firefoxfirefox_esrFirefox
CWE ID-CWE-787
Out-of-bounds Write
CVE-2009-0733
Matching Score-6
Assigner-MITRE Corporation
ShareView Details
Matching Score-6
Assigner-MITRE Corporation
CVSS Score-9.3||HIGH
EPSS-5.53% / 92.00%
||
7 Day CHG~0.00%
Published-23 Mar, 2009 | 14:00
Updated-23 Apr, 2026 | 00:35
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

Multiple stack-based buffer overflows in the ReadSetOfCurves function in LittleCMS (aka lcms or liblcms) before 1.18beta2, as used in Firefox 3.1beta, OpenJDK, and GIMP, allow context-dependent attackers to execute arbitrary code via a crafted image file associated with a large integer value for the (1) input or (2) output channel, related to the ReadLUT_A2B and ReadLUT_B2A functions.

Action-Not Available
Vendor-littlecmsn/aGIMPMozilla CorporationSun Microsystems (Oracle Corporation)
Product-little_cmsopenjdkfirefoxgimpn/a
CWE ID-CWE-787
Out-of-bounds Write
CVE-2020-6822
Matching Score-6
Assigner-Mozilla Corporation
ShareView Details
Matching Score-6
Assigner-Mozilla Corporation
CVSS Score-8.8||HIGH
EPSS-1.29% / 67.28%
||
7 Day CHG~0.00%
Published-24 Apr, 2020 | 15:54
Updated-04 Aug, 2024 | 09:11
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

On 32-bit builds, an out of bounds write could have occurred when processing an image larger than 4 GB in <code>GMPDecodeData</code>. It is possible that with enough effort this could have been exploited to run arbitrary code. This vulnerability affects Thunderbird < 68.7.0, Firefox ESR < 68.7, and Firefox < 75.

Action-Not Available
Vendor-Mozilla Corporation
Product-firefoxthunderbirdfirefox_esrThunderbirdFirefox ESRFirefox
CWE ID-CWE-787
Out-of-bounds Write
CVE-2020-6815
Matching Score-6
Assigner-Mozilla Corporation
ShareView Details
Matching Score-6
Assigner-Mozilla Corporation
CVSS Score-9.8||CRITICAL
EPSS-1.33% / 68.02%
||
7 Day CHG~0.00%
Published-25 Mar, 2020 | 21:10
Updated-04 Aug, 2024 | 09:11
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

Mozilla developers reported memory safety and script safety bugs present in Firefox 73. Some of these bugs showed evidence of memory corruption or escalation of privilege and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 74.

Action-Not Available
Vendor-Mozilla Corporation
Product-firefoxFirefox
CWE ID-CWE-787
Out-of-bounds Write
CVE-2016-10196
Matching Score-6
Assigner-MITRE Corporation
ShareView Details
Matching Score-6
Assigner-MITRE Corporation
CVSS Score-7.5||HIGH
EPSS-5.21% / 91.63%
||
7 Day CHG~0.00%
Published-15 Mar, 2017 | 15:00
Updated-13 May, 2026 | 00:24
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

Stack-based buffer overflow in the evutil_parse_sockaddr_port function in evutil.c in libevent before 2.1.6-beta allows attackers to cause a denial of service (segmentation fault) via vectors involving a long string in brackets in the ip_as_string argument.

Action-Not Available
Vendor-libevent_projectn/aMozilla CorporationDebian GNU/Linux
Product-libeventdebian_linuxthunderbirdfirefoxn/a
CWE ID-CWE-787
Out-of-bounds Write
CVE-2020-6801
Matching Score-6
Assigner-Mozilla Corporation
ShareView Details
Matching Score-6
Assigner-Mozilla Corporation
CVSS Score-8.8||HIGH
EPSS-1.41% / 69.87%
||
7 Day CHG+0.03%
Published-02 Mar, 2020 | 04:05
Updated-04 Aug, 2024 | 09:11
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

Mozilla developers reported memory safety bugs present in Firefox 72. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 73.

Action-Not Available
Vendor-Mozilla CorporationCanonical Ltd.
Product-firefoxubuntu_linuxFirefox
CWE ID-CWE-787
Out-of-bounds Write
CVE-2020-6800
Matching Score-6
Assigner-Mozilla Corporation
ShareView Details
Matching Score-6
Assigner-Mozilla Corporation
CVSS Score-8.8||HIGH
EPSS-2.27% / 81.26%
||
7 Day CHG~0.00%
Published-02 Mar, 2020 | 04:05
Updated-04 Aug, 2024 | 09:11
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

Mozilla developers and community members reported memory safety bugs present in Firefox 72 and Firefox ESR 68.4. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. In general, these flaws cannot be exploited through email in the Thunderbird product because scripting is disabled when reading mail, but are potentially risks in browser or browser-like contexts. This vulnerability affects Thunderbird < 68.5, Firefox < 73, and Firefox < ESR68.5.

Action-Not Available
Vendor-Mozilla CorporationCanonical Ltd.
Product-firefoxubuntu_linuxthunderbirdfirefox_esrThunderbirdFirefox
CWE ID-CWE-787
Out-of-bounds Write
CVE-2026-8973
Matching Score-6
Assigner-Mozilla Corporation
ShareView Details
Matching Score-6
Assigner-Mozilla Corporation
CVSS Score-8.8||HIGH
EPSS-0.34% / 25.86%
||
7 Day CHG~0.00%
Published-19 May, 2026 | 12:30
Updated-23 Jul, 2026 | 20:10
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Memory safety bugs fixed in Firefox 151

Memory safety bugs present in Firefox 150. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 151 and Thunderbird 151.

Action-Not Available
Vendor-Red Hat, Inc.Mozilla Corporation
Product-thunderbirdfirefoxThunderbirdFirefoxRed Hat Enterprise Linux 9Red Hat Enterprise Linux 7Red Hat Enterprise Linux 6Red Hat Enterprise Linux 8Red Hat Enterprise Linux 10
CWE ID-CWE-119
Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE ID-CWE-787
Out-of-bounds Write
CVE-2026-8975
Matching Score-6
Assigner-Mozilla Corporation
ShareView Details
Matching Score-6
Assigner-Mozilla Corporation
CVSS Score-8.8||HIGH
EPSS-0.43% / 35.04%
||
7 Day CHG~0.00%
Published-19 May, 2026 | 12:30
Updated-23 Jul, 2026 | 20:10
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Memory safety bugs fixed in Firefox ESR 115.36, Firefox ESR 140.11 and Firefox 151

Memory safety bugs present in Firefox ESR 115.35, Firefox ESR 140.10 and Firefox 150. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 151, Firefox ESR 115.36, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.

Action-Not Available
Vendor-Red Hat, Inc.Mozilla Corporation
Product-thunderbirdfirefoxThunderbirdFirefoxRed Hat Enterprise Linux 7Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-OnRed Hat Enterprise Linux 6Red Hat Enterprise Linux 10Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportRed Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportRed Hat Enterprise Linux 8.8 Telecommunications Update ServiceRed Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-OnRed Hat Enterprise Linux 9Red Hat Enterprise Linux 9.2 Update Services for SAP SolutionsRed Hat Enterprise Linux 9.6 Extended Update SupportRed Hat Enterprise Linux 8Red Hat Enterprise Linux 7 Extended Lifecycle SupportRed Hat Enterprise Linux 8.8 Update Services for SAP SolutionsRed Hat Enterprise Linux 10.0 Extended Update SupportRed Hat Enterprise Linux 9.4 Update Services for SAP Solutions
CWE ID-CWE-119
Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE ID-CWE-787
Out-of-bounds Write
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