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Vulnerability Details :

CVE-2026-4892

Summary
Assigner-certcc
Assigner Org ID-37e5125f-f79b-445b-8fad-9564f167944b
Published At-11 May, 2026 | 16:47
Updated At-02 Jul, 2026 | 12:05
Rejected At-
Credits

CVE-2026-4892

A heap-based out-of-bounds write vulnerability in the DHCPv6 implementation of dnsmasq allows local attackers to execute arbitrary code with root privileges via a crafted DHCPv6 packet.

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)
â–¼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:certcc
Assigner Org ID:37e5125f-f79b-445b-8fad-9564f167944b
Published At:11 May, 2026 | 16:47
Updated At:02 Jul, 2026 | 12:05
Rejected At:
â–¼CVE Numbering Authority (CNA)
CVE-2026-4892

A heap-based out-of-bounds write vulnerability in the DHCPv6 implementation of dnsmasq allows local attackers to execute arbitrary code with root privileges via a crafted DHCPv6 packet.

Affected Products
Vendor
dnsmasq
Product
dnsmasq
Versions
Affected
  • From 0 before 2.92rel2 (custom)
Problem Types
TypeCWE IDDescription
N/AN/ACWE-122: Heap-based Buffer Overflow
Type: N/A
CWE ID: N/A
Description: CWE-122: Heap-based Buffer Overflow
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2026q2/018471.html
N/A
https://www.kb.cert.org/vuls/id/471747
N/A
https://thekelleys.org.uk/dnsmasq/CVE/
N/A
https://github.com/NixOS/nixpkgs/pull/519082
N/A
https://github.com/NixOS/nixpkgs/pull/519093
N/A
https://github.com/pi-hole/FTL/releases/tag/v6.6.2
N/A
Hyperlink: https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2026q2/018471.html
Resource: N/A
Hyperlink: https://www.kb.cert.org/vuls/id/471747
Resource: N/A
Hyperlink: https://thekelleys.org.uk/dnsmasq/CVE/
Resource: N/A
Hyperlink: https://github.com/NixOS/nixpkgs/pull/519082
Resource: N/A
Hyperlink: https://github.com/NixOS/nixpkgs/pull/519093
Resource: N/A
Hyperlink: https://github.com/pi-hole/FTL/releases/tag/v6.6.2
Resource: N/A
â–¼Authorized Data Publishers (ADP)
1. CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
3.18.4HIGH
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Version: 3.1
Base score: 8.4
Base severity: HIGH
Vector:
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
2. dnsmasq: DHCPv6 CLID buffer overflow in helper process

A heap buffer overflow was discovered in dnsmasq's DHCP script helper process. When processing DHCPv6 client identifiers (CLIDs), the helper hex-encodes the raw CLID bytes into a fixed-size buffer without length validation. Since DHCPv6 CLIDs can be up to 65,535 bytes, a crafted DHCPv6 packet can overflow the buffer with attacker-controlled content. The helper process runs with root privileges.

Affected Products
Vendor
Red Hat, Inc.Red Hat
Product
Red Hat Enterprise Linux AppStream (v. 10)
CPEs
  • cpe:/o:redhat:enterprise_linux:10.2
Default Status
affected
Vendor
Red Hat, Inc.Red Hat
Product
Red Hat Enterprise Linux AppStream (v. 8)
CPEs
  • cpe:/a:redhat:enterprise_linux:8::appstream
Default Status
affected
Vendor
Red Hat, Inc.Red Hat
Product
Red Hat Enterprise Linux AppStream EUS (v.9.6)
CPEs
  • cpe:/a:redhat:rhel_eus:9.6::appstream
Default Status
affected
Vendor
Red Hat, Inc.Red Hat
Product
Red Hat Enterprise Linux AppStream (v. 9)
CPEs
  • cpe:/a:redhat:enterprise_linux:9::appstream
Default Status
affected
Vendor
Red Hat, Inc.Red Hat
Product
Red Hat Enterprise Linux 6
CPEs
  • cpe:/o:redhat:enterprise_linux:6
Default Status
affected
Vendor
Red Hat, Inc.Red Hat
Product
Red Hat Enterprise Linux 7
CPEs
  • cpe:/o:redhat:enterprise_linux:7
Default Status
affected
Vendor
Red Hat, Inc.Red Hat
Product
Red Hat OpenShift Container Platform 4
CPEs
  • cpe:/a:redhat:openshift:4
Default Status
affected
Problem Types
TypeCWE IDDescription
CWECWE-122Heap-based Buffer Overflow
Type: CWE
CWE ID: CWE-122
Description: Heap-based Buffer Overflow
Metrics
VersionBase scoreBase severityVector
3.18.8HIGH
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Version: 3.1
Base score: 8.8
Base severity: HIGH
Vector:
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Metrics Other Info
Red Hat severity rating
value:
Important
namespace:
https://access.redhat.com/security/updates/classification/
Impacts
CAPEC IDDescription
Solutions

RHSA-2026:19158: Red Hat Enterprise Linux AppStream (v. 10)

RHSA-2026:20589: Red Hat Enterprise Linux AppStream (v. 8)

RHSA-2026:34508: Red Hat Enterprise Linux AppStream EUS (v.9.6)

RHSA-2026:19373: Red Hat Enterprise Linux AppStream (v. 9)

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Reported to Red Hat.2026-04-14 22:44:58
Made public.2026-05-09 00:00:00
Event: Reported to Red Hat.
Date: 2026-04-14 22:44:58
Event: Made public.
Date: 2026-05-09 00:00:00
Replaced By

Rejected Reason

References
HyperlinkResource
https://access.redhat.com/security/cve/CVE-2026-4892
vdb-entry
x_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2458518
issue-tracking
x_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4892.json
x_sadp-csaf-vex
https://access.redhat.com/errata/RHSA-2026:19158
vendor-advisory
x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:20589
vendor-advisory
x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:34508
vendor-advisory
x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:19373
vendor-advisory
x_refsource_REDHAT
Hyperlink: https://access.redhat.com/security/cve/CVE-2026-4892
Resource:
vdb-entry
x_refsource_REDHAT
Hyperlink: https://bugzilla.redhat.com/show_bug.cgi?id=2458518
Resource:
issue-tracking
x_refsource_REDHAT
Hyperlink: https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4892.json
Resource:
x_sadp-csaf-vex
Hyperlink: https://access.redhat.com/errata/RHSA-2026:19158
Resource:
vendor-advisory
x_refsource_REDHAT
Hyperlink: https://access.redhat.com/errata/RHSA-2026:20589
Resource:
vendor-advisory
x_refsource_REDHAT
Hyperlink: https://access.redhat.com/errata/RHSA-2026:34508
Resource:
vendor-advisory
x_refsource_REDHAT
Hyperlink: https://access.redhat.com/errata/RHSA-2026:19373
Resource:
vendor-advisory
x_refsource_REDHAT
Information is not available yet
â–¼National Vulnerability Database (NVD)
nvd.nist.gov
Source:cret@cert.org
Published At:11 May, 2026 | 18:16
Updated At:30 Jun, 2026 | 03:20

A heap-based out-of-bounds write vulnerability in the DHCPv6 implementation of dnsmasq allows local attackers to execute arbitrary code with root privileges via a crafted DHCPv6 packet.

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
Secondary3.18.4HIGH
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Secondary3.18.8HIGH
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
N/A
Type: Secondary
Version: 3.1
Base score: 8.4
Base severity: HIGH
Vector:
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Type: Secondary
Version: 3.1
Base score: 8.8
Base severity: HIGH
Vector:
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Type: N/A
Version:
Base score:
Base severity: N/A
Vector:
CPE Matches

Weaknesses
CWE IDTypeSource
CWE-122Secondary0b0ca135-0b70-47e7-9f44-1890c2a1c46c
CWE ID: CWE-122
Type: Secondary
Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Evaluator Description

Evaluator Impact

Evaluator Solution

Vendor Statements

References
HyperlinkSourceResource
https://github.com/NixOS/nixpkgs/pull/519082cret@cert.org
N/A
https://github.com/NixOS/nixpkgs/pull/519093cret@cert.org
N/A
https://github.com/pi-hole/FTL/releases/tag/v6.6.2cret@cert.org
N/A
https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2026q2/018471.htmlcret@cert.org
N/A
https://thekelleys.org.uk/dnsmasq/CVE/cret@cert.org
N/A
https://www.kb.cert.org/vuls/id/471747cret@cert.org
N/A
https://access.redhat.com/errata/RHSA-2026:191580b0ca135-0b70-47e7-9f44-1890c2a1c46c
N/A
https://access.redhat.com/errata/RHSA-2026:193730b0ca135-0b70-47e7-9f44-1890c2a1c46c
N/A
https://access.redhat.com/errata/RHSA-2026:205890b0ca135-0b70-47e7-9f44-1890c2a1c46c
N/A
https://access.redhat.com/security/cve/CVE-2026-48920b0ca135-0b70-47e7-9f44-1890c2a1c46c
N/A
https://bugzilla.redhat.com/show_bug.cgi?id=24585180b0ca135-0b70-47e7-9f44-1890c2a1c46c
N/A
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4892.json0b0ca135-0b70-47e7-9f44-1890c2a1c46c
N/A
Hyperlink: https://github.com/NixOS/nixpkgs/pull/519082
Source: cret@cert.org
Resource: N/A
Hyperlink: https://github.com/NixOS/nixpkgs/pull/519093
Source: cret@cert.org
Resource: N/A
Hyperlink: https://github.com/pi-hole/FTL/releases/tag/v6.6.2
Source: cret@cert.org
Resource: N/A
Hyperlink: https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2026q2/018471.html
Source: cret@cert.org
Resource: N/A
Hyperlink: https://thekelleys.org.uk/dnsmasq/CVE/
Source: cret@cert.org
Resource: N/A
Hyperlink: https://www.kb.cert.org/vuls/id/471747
Source: cret@cert.org
Resource: N/A
Hyperlink: https://access.redhat.com/errata/RHSA-2026:19158
Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Resource: N/A
Hyperlink: https://access.redhat.com/errata/RHSA-2026:19373
Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Resource: N/A
Hyperlink: https://access.redhat.com/errata/RHSA-2026:20589
Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Resource: N/A
Hyperlink: https://access.redhat.com/security/cve/CVE-2026-4892
Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Resource: N/A
Hyperlink: https://bugzilla.redhat.com/show_bug.cgi?id=2458518
Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Resource: N/A
Hyperlink: https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4892.json
Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Resource: N/A

Change History

0
Information is not available yet

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Action-Not Available
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Heap-based Buffer Overflow
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Matching Score-4
Assigner-Microsoft Corporation
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Matching Score-4
Assigner-Microsoft Corporation
CVSS Score-8.4||HIGH
EPSS-0.55% / 42.07%
||
7 Day CHG~0.00%
Published-08 Jul, 2025 | 16:58
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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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Out-of-bounds read in Microsoft Office allows an unauthorized attacker to execute code locally.

Action-Not Available
Vendor-Microsoft Corporation
Product-365_appsofficeoffice_long_term_servicing_channelMicrosoft Office LTSC 2024Microsoft 365 Apps for EnterpriseMicrosoft Office LTSC for Mac 2021Microsoft Office LTSC for Mac 2024Microsoft Office for AndroidMicrosoft Office LTSC 2021Microsoft Office 2019Microsoft Office 2016
CWE ID-CWE-122
Heap-based Buffer Overflow
CWE ID-CWE-125
Out-of-bounds Read
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Matching Score-4
Assigner-Microsoft Corporation
ShareView Details
Matching Score-4
Assigner-Microsoft Corporation
CVSS Score-8.4||HIGH
EPSS-0.66% / 47.01%
||
7 Day CHG~0.00%
Published-10 Jun, 2025 | 17:02
Updated-26 Feb, 2026 | 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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Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.

Action-Not Available
Vendor-Microsoft Corporation
Product-officeoffice_long_term_servicing_channel365_appsMicrosoft Office 2016Microsoft 365 Apps for EnterpriseMicrosoft Office LTSC 2021Microsoft Office 2019Microsoft Office LTSC for Mac 2021Microsoft Office LTSC 2024Microsoft Office LTSC for Mac 2024Microsoft Office for Android
CWE ID-CWE-122
Heap-based Buffer Overflow
CVE-2025-32717
Matching Score-4
Assigner-Microsoft Corporation
ShareView Details
Matching Score-4
Assigner-Microsoft Corporation
CVSS Score-8.4||HIGH
EPSS-0.51% / 39.82%
||
7 Day CHG~0.00%
Published-10 Jun, 2025 | 23:15
Updated-20 Feb, 2026 | 16:00
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Microsoft Word Remote Code Execution Vulnerability

Heap-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code locally.

Action-Not Available
Vendor-Microsoft Corporation
Product-365_appsMicrosoft 365 Apps for Enterprise
CWE ID-CWE-122
Heap-based Buffer Overflow
CVE-2021-27253
Matching Score-4
Assigner-Zero Day Initiative
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Matching Score-4
Assigner-Zero Day Initiative
CVSS Score-8.8||HIGH
EPSS-1.13% / 62.37%
||
7 Day CHG~0.00%
Published-14 Apr, 2021 | 15:45
Updated-03 Aug, 2024 | 20:48
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of NETGEAR Nighthawk R7800. Although authentication is required to exploit this vulnerability, the existing authentication mechanism can be bypassed. The specific flaw exists within the handling of the rc_service parameter provided to apply_bind.cgi. The issue results from the lack of proper validation of a user-supplied string before using it to execute a system call. An attacker can leverage this vulnerability to execute code in the context of root. Was ZDI-CAN-12303.

Action-Not Available
Vendor-NETGEAR, Inc.
Product-br500_firmwarerbk12rbk43sbr500r8900_firmwarerbr40_firmwarerbk23_firmwarerbk14_firmwarerbk15_firmwareex6410ex6420_firmwareex7300v2_firmwarebr200_firmwareex6250_firmwarerbk53_firmwarexr500_firmwarexr700_firmwarerbk15xr450_firmwareex7300rbk12_firmwarerbs40rbs50y_firmwarer8900rbs40_firmwarer9000_firmwarerbr10rbs10_firmwarerbk43_firmwareex6410_firmwarerbs20rbs50_firmwareex6150r9000rbs50yex7700_firmwarer7800rbk23rbs10r7800_firmwareex6100v2_firmwarerbk20_firmwarexr450ex6150_firmwarexr700ex6400rbk43s_firmwarerbk20ex6400_firmwarerbk14ex7300_firmwarerbk44_firmwarerbs20_firmwarebr200d7800rbk44ex8000rbk40ex7320_firmwarerbr20rbk40_firmwarerbk13xr500ex6400v2_firmwareex6100ex6420d7800_firmwarerbk43ex8000_firmwareex6250rbr10_firmwarerbr40rbs50rbr50_firmwarerbr50ex7700rbk13_firmwarelbr20rbr20_firmwareex7320rbk50rbk53lbr20_firmwarerbk50_firmwareR7800
CWE ID-CWE-122
Heap-based Buffer Overflow
CWE ID-CWE-787
Out-of-bounds Write
CVE-2020-10928
Matching Score-4
Assigner-Zero Day Initiative
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Matching Score-4
Assigner-Zero Day Initiative
CVSS Score-8.4||HIGH
EPSS-0.64% / 46.17%
||
7 Day CHG~0.00%
Published-28 Jul, 2020 | 17:10
Updated-04 Aug, 2024 | 11:14
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of NETGEAR R6700 V1.0.4.84_10.0.58 routers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the handling of string table file uploads. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length, heap-based buffer. An attacker can leverage this vulnerability to execute code in the context of the web server. Was ZDI-CAN-9767.

Action-Not Available
Vendor-NETGEAR, Inc.
Product-r6700_firmwarer6700R6700
CWE ID-CWE-122
Heap-based Buffer Overflow
CVE-2019-9501
Matching Score-4
Assigner-CERT/CC
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Matching Score-4
Assigner-CERT/CC
CVSS Score-7.9||HIGH
EPSS-2.93% / 85.39%
||
7 Day CHG~0.00%
Published-03 Feb, 2020 | 21:00
Updated-04 Aug, 2024 | 21:54
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Broadcom wl driver is vulnerable to heap buffer overflow

The Broadcom wl WiFi driver is vulnerable to a heap buffer overflow. By supplying a vendor information element with a data length larger than 32 bytes, a heap buffer overflow is triggered in wlc_wpa_sup_eapol. In the worst case scenario, by sending specially-crafted WiFi packets, a remote, unauthenticated attacker may be able to execute arbitrary code on a vulnerable system. More typically, this vulnerability will result in denial-of-service conditions.

Action-Not Available
Vendor-Broadcom Inc.Synology, Inc.
Product-bcm4339router_managerbcm4339_firmwareWiFi drivers
CWE ID-CWE-122
Heap-based Buffer Overflow
CWE ID-CWE-787
Out-of-bounds Write
CVE-2019-9502
Matching Score-4
Assigner-CERT/CC
ShareView Details
Matching Score-4
Assigner-CERT/CC
CVSS Score-7.9||HIGH
EPSS-2.42% / 82.18%
||
7 Day CHG~0.00%
Published-03 Feb, 2020 | 21:00
Updated-04 Aug, 2024 | 21:54
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Broadcom wl driver is vulnerable to heap buffer overflow

The Broadcom wl WiFi driver is vulnerable to a heap buffer overflow. If the vendor information element data length is larger than 164 bytes, a heap buffer overflow is triggered in wlc_wpa_plumb_gtk. In the worst case scenario, by sending specially-crafted WiFi packets, a remote, unauthenticated attacker may be able to execute arbitrary code on a vulnerable system. More typically, this vulnerability will result in denial-of-service conditions.

Action-Not Available
Vendor-Broadcom Inc.Synology, Inc.
Product-bcm4339router_managerbcm4339_firmwareWiFi drivers
CWE ID-CWE-122
Heap-based Buffer Overflow
CWE ID-CWE-787
Out-of-bounds Write
CVE-2019-3846
Matching Score-4
Assigner-Red Hat, Inc.
ShareView Details
Matching Score-4
Assigner-Red Hat, Inc.
CVSS Score-8||HIGH
EPSS-5.65% / 92.02%
||
7 Day CHG~0.00%
Published-03 Jun, 2019 | 18:25
Updated-04 Aug, 2024 | 19:19
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

A flaw that allowed an attacker to corrupt memory and possibly escalate privileges was found in the mwifiex kernel module while connecting to a malicious wireless network.

Action-Not Available
Vendor-n/aFedora ProjectopenSUSECanonical Ltd.Red Hat, Inc.Linux Kernel Organization, IncNetApp, Inc.Debian GNU/Linux
Product-h610subuntu_linuxa700s_firmwaredebian_linuxlinux_kernelcn1610hci_management_nodeenterprise_linuxfedoraa700sh610s_firmwarecn1610_firmwareactive_iq_unified_manager_for_vmware_vspheresolidfireleapkernel
CWE ID-CWE-122
Heap-based Buffer Overflow
CWE ID-CWE-787
Out-of-bounds Write
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