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Vulnerability Details :

CVE-2021-39219

Summary
Assigner-GitHub_M
Assigner Org ID-a0819718-46f1-4df5-94e2-005712e83aaa
Published At-17 Sep, 2021 | 20:10
Updated At-04 Aug, 2024 | 01:58
Rejected At-
Credits

Wrong type for `Linker`-define functions when used across two `Engine`s

Wasmtime is an open source runtime for WebAssembly & WASI. Wasmtime before version 0.30.0 is affected by a type confusion vulnerability. As a Rust library the `wasmtime` crate clearly marks which functions are safe and which are `unsafe`, guaranteeing that if consumers never use `unsafe` then it should not be possible to have memory unsafety issues in their embeddings of Wasmtime. An issue was discovered in the safe API of `Linker::func_*` APIs. These APIs were previously not sound when one `Engine` was used to create the `Linker` and then a different `Engine` was used to create a `Store` and then the `Linker` was used to instantiate a module into that `Store`. Cross-`Engine` usage of functions is not supported in Wasmtime and this can result in type confusion of function pointers, resulting in being able to safely call a function with the wrong type. Triggering this bug requires using at least two `Engine` values in an embedding and then additionally using two different values with a `Linker` (one at the creation time of the `Linker` and another when instantiating a module with the `Linker`). It's expected that usage of more-than-one `Engine` in an embedding is relatively rare since an `Engine` is intended to be a globally shared resource, so the expectation is that the impact of this issue is relatively small. The fix implemented is to change this behavior to `panic!()` in Rust instead of silently allowing it. Using different `Engine` instances with a `Linker` is a programmer bug that `wasmtime` catches at runtime. This bug has been patched and users should upgrade to Wasmtime version 0.30.0. If you cannot upgrade Wasmtime and are using more than one `Engine` in your embedding it's recommended to instead use only one `Engine` for the entire program if possible. An `Engine` is designed to be a globally shared resource that is suitable to have only one for the lifetime of an entire process. If using multiple `Engine`s is required then code should be audited to ensure that `Linker` is only used with one `Engine`.

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:GitHub_M
Assigner Org ID:a0819718-46f1-4df5-94e2-005712e83aaa
Published At:17 Sep, 2021 | 20:10
Updated At:04 Aug, 2024 | 01:58
Rejected At:
▼CVE Numbering Authority (CNA)
Wrong type for `Linker`-define functions when used across two `Engine`s

Wasmtime is an open source runtime for WebAssembly & WASI. Wasmtime before version 0.30.0 is affected by a type confusion vulnerability. As a Rust library the `wasmtime` crate clearly marks which functions are safe and which are `unsafe`, guaranteeing that if consumers never use `unsafe` then it should not be possible to have memory unsafety issues in their embeddings of Wasmtime. An issue was discovered in the safe API of `Linker::func_*` APIs. These APIs were previously not sound when one `Engine` was used to create the `Linker` and then a different `Engine` was used to create a `Store` and then the `Linker` was used to instantiate a module into that `Store`. Cross-`Engine` usage of functions is not supported in Wasmtime and this can result in type confusion of function pointers, resulting in being able to safely call a function with the wrong type. Triggering this bug requires using at least two `Engine` values in an embedding and then additionally using two different values with a `Linker` (one at the creation time of the `Linker` and another when instantiating a module with the `Linker`). It's expected that usage of more-than-one `Engine` in an embedding is relatively rare since an `Engine` is intended to be a globally shared resource, so the expectation is that the impact of this issue is relatively small. The fix implemented is to change this behavior to `panic!()` in Rust instead of silently allowing it. Using different `Engine` instances with a `Linker` is a programmer bug that `wasmtime` catches at runtime. This bug has been patched and users should upgrade to Wasmtime version 0.30.0. If you cannot upgrade Wasmtime and are using more than one `Engine` in your embedding it's recommended to instead use only one `Engine` for the entire program if possible. An `Engine` is designed to be a globally shared resource that is suitable to have only one for the lifetime of an entire process. If using multiple `Engine`s is required then code should be audited to ensure that `Linker` is only used with one `Engine`.

Affected Products
Vendor
bytecodealliance
Product
wasmtime
Versions
Affected
  • <= 0.29.0
Problem Types
TypeCWE IDDescription
CWECWE-843CWE-843: Access of Resource Using Incompatible Type ('Type Confusion')
Type: CWE
CWE ID: CWE-843
Description: CWE-843: Access of Resource Using Incompatible Type ('Type Confusion')
Metrics
VersionBase scoreBase severityVector
3.16.3MEDIUM
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:H
Version: 3.1
Base score: 6.3
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:H
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
https://crates.io/crates/wasmtime
x_refsource_MISC
https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-q879-9g95-56mx
x_refsource_CONFIRM
https://github.com/bytecodealliance/wasmtime/commit/b39f087414f27ae40c44449ed5d1154e03449bff
x_refsource_MISC
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Z2Z33FTXFQ6EOINVEQIP4DFBG53G5XIY/
vendor-advisory
x_refsource_FEDORA
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WAVBRYDDUIY2ZR3K3FO4BVYJKIMJ5TP7/
vendor-advisory
x_refsource_FEDORA
Hyperlink: https://crates.io/crates/wasmtime
Resource:
x_refsource_MISC
Hyperlink: https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-q879-9g95-56mx
Resource:
x_refsource_CONFIRM
Hyperlink: https://github.com/bytecodealliance/wasmtime/commit/b39f087414f27ae40c44449ed5d1154e03449bff
Resource:
x_refsource_MISC
Hyperlink: https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Z2Z33FTXFQ6EOINVEQIP4DFBG53G5XIY/
Resource:
vendor-advisory
x_refsource_FEDORA
Hyperlink: https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WAVBRYDDUIY2ZR3K3FO4BVYJKIMJ5TP7/
Resource:
vendor-advisory
x_refsource_FEDORA
▼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://crates.io/crates/wasmtime
x_refsource_MISC
x_transferred
https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-q879-9g95-56mx
x_refsource_CONFIRM
x_transferred
https://github.com/bytecodealliance/wasmtime/commit/b39f087414f27ae40c44449ed5d1154e03449bff
x_refsource_MISC
x_transferred
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Z2Z33FTXFQ6EOINVEQIP4DFBG53G5XIY/
vendor-advisory
x_refsource_FEDORA
x_transferred
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WAVBRYDDUIY2ZR3K3FO4BVYJKIMJ5TP7/
vendor-advisory
x_refsource_FEDORA
x_transferred
Hyperlink: https://crates.io/crates/wasmtime
Resource:
x_refsource_MISC
x_transferred
Hyperlink: https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-q879-9g95-56mx
Resource:
x_refsource_CONFIRM
x_transferred
Hyperlink: https://github.com/bytecodealliance/wasmtime/commit/b39f087414f27ae40c44449ed5d1154e03449bff
Resource:
x_refsource_MISC
x_transferred
Hyperlink: https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Z2Z33FTXFQ6EOINVEQIP4DFBG53G5XIY/
Resource:
vendor-advisory
x_refsource_FEDORA
x_transferred
Hyperlink: https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WAVBRYDDUIY2ZR3K3FO4BVYJKIMJ5TP7/
Resource:
vendor-advisory
x_refsource_FEDORA
x_transferred
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:security-advisories@github.com
Published At:17 Sep, 2021 | 20:15
Updated At:07 Nov, 2023 | 03:37

Wasmtime is an open source runtime for WebAssembly & WASI. Wasmtime before version 0.30.0 is affected by a type confusion vulnerability. As a Rust library the `wasmtime` crate clearly marks which functions are safe and which are `unsafe`, guaranteeing that if consumers never use `unsafe` then it should not be possible to have memory unsafety issues in their embeddings of Wasmtime. An issue was discovered in the safe API of `Linker::func_*` APIs. These APIs were previously not sound when one `Engine` was used to create the `Linker` and then a different `Engine` was used to create a `Store` and then the `Linker` was used to instantiate a module into that `Store`. Cross-`Engine` usage of functions is not supported in Wasmtime and this can result in type confusion of function pointers, resulting in being able to safely call a function with the wrong type. Triggering this bug requires using at least two `Engine` values in an embedding and then additionally using two different values with a `Linker` (one at the creation time of the `Linker` and another when instantiating a module with the `Linker`). It's expected that usage of more-than-one `Engine` in an embedding is relatively rare since an `Engine` is intended to be a globally shared resource, so the expectation is that the impact of this issue is relatively small. The fix implemented is to change this behavior to `panic!()` in Rust instead of silently allowing it. Using different `Engine` instances with a `Linker` is a programmer bug that `wasmtime` catches at runtime. This bug has been patched and users should upgrade to Wasmtime version 0.30.0. If you cannot upgrade Wasmtime and are using more than one `Engine` in your embedding it's recommended to instead use only one `Engine` for the entire program if possible. An `Engine` is designed to be a globally shared resource that is suitable to have only one for the lifetime of an entire process. If using multiple `Engine`s is required then code should be audited to ensure that `Linker` is only used with one `Engine`.

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
Primary3.16.3MEDIUM
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:H
Secondary3.16.3MEDIUM
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:H
Primary2.03.3LOW
AV:L/AC:M/Au:N/C:N/I:P/A:P
Type: Primary
Version: 3.1
Base score: 6.3
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:H
Type: Secondary
Version: 3.1
Base score: 6.3
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:H
Type: Primary
Version: 2.0
Base score: 3.3
Base severity: LOW
Vector:
AV:L/AC:M/Au:N/C:N/I:P/A:P
CPE Matches

bytecodealliance
bytecodealliance
>>wasmtime>>Versions before 0.30.0(exclusive)
cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:*:*:*
Fedora Project
fedoraproject
>>fedora>>34
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
Fedora Project
fedoraproject
>>fedora>>35
cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*
Weaknesses
CWE IDTypeSource
CWE-843Primarysecurity-advisories@github.com
CWE ID: CWE-843
Type: Primary
Source: security-advisories@github.com
Evaluator Description

Evaluator Impact

Evaluator Solution

Vendor Statements

References
HyperlinkSourceResource
https://crates.io/crates/wasmtimesecurity-advisories@github.com
Product
https://github.com/bytecodealliance/wasmtime/commit/b39f087414f27ae40c44449ed5d1154e03449bffsecurity-advisories@github.com
Patch
Third Party Advisory
https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-q879-9g95-56mxsecurity-advisories@github.com
Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WAVBRYDDUIY2ZR3K3FO4BVYJKIMJ5TP7/security-advisories@github.com
N/A
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Z2Z33FTXFQ6EOINVEQIP4DFBG53G5XIY/security-advisories@github.com
N/A
Hyperlink: https://crates.io/crates/wasmtime
Source: security-advisories@github.com
Resource:
Product
Hyperlink: https://github.com/bytecodealliance/wasmtime/commit/b39f087414f27ae40c44449ed5d1154e03449bff
Source: security-advisories@github.com
Resource:
Patch
Third Party Advisory
Hyperlink: https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-q879-9g95-56mx
Source: security-advisories@github.com
Resource:
Third Party Advisory
Hyperlink: https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WAVBRYDDUIY2ZR3K3FO4BVYJKIMJ5TP7/
Source: security-advisories@github.com
Resource: N/A
Hyperlink: https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Z2Z33FTXFQ6EOINVEQIP4DFBG53G5XIY/
Source: security-advisories@github.com
Resource: N/A

Change History

0
Information is not available yet

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Updated-13 Feb, 2025 | 17:54
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

Type Confusion in V8 in Google Chrome prior to 126.0.6478.54 allowed a remote attacker to perform out of bounds memory access via a crafted HTML page. (Chromium security severity: High)

Action-Not Available
Vendor-Fedora ProjectGoogle LLC
Product-chromefedoraChromechromefedora
CWE ID-CWE-843
Access of Resource Using Incompatible Type ('Type Confusion')
CVE-2021-4056
Matching Score-6
Assigner-Chrome
ShareView Details
Matching Score-6
Assigner-Chrome
CVSS Score-8.8||HIGH
EPSS-0.56% / 67.37%
||
7 Day CHG~0.00%
Published-23 Dec, 2021 | 00:45
Updated-03 Aug, 2024 | 17:16
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

Type confusion in loader in Google Chrome prior to 96.0.4664.93 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.

Action-Not Available
Vendor-Fedora ProjectGoogle LLCDebian GNU/Linux
Product-chromedebian_linuxfedoraChrome
CWE ID-CWE-843
Access of Resource Using Incompatible Type ('Type Confusion')
CVE-2021-30627
Matching Score-6
Assigner-Chrome
ShareView Details
Matching Score-6
Assigner-Chrome
CVSS Score-8.8||HIGH
EPSS-0.81% / 73.32%
||
7 Day CHG~0.00%
Published-08 Oct, 2021 | 20:50
Updated-03 Aug, 2024 | 22:40
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

Type confusion in Blink layout in Google Chrome prior to 93.0.4577.82 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.

Action-Not Available
Vendor-Fedora ProjectGoogle LLC
Product-chromefedoraChrome
CWE ID-CWE-843
Access of Resource Using Incompatible Type ('Type Confusion')
CVE-2021-30598
Matching Score-6
Assigner-Chrome
ShareView Details
Matching Score-6
Assigner-Chrome
CVSS Score-8.8||HIGH
EPSS-1.88% / 82.39%
||
7 Day CHG~0.00%
Published-26 Aug, 2021 | 17:40
Updated-03 Aug, 2024 | 22:40
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

Type confusion in V8 in Google Chrome prior to 92.0.4515.159 allowed a remote attacker to execute arbitrary code inside a sandbox via a crafted HTML page.

Action-Not Available
Vendor-Fedora ProjectGoogle LLC
Product-chromefedoraChrome
CWE ID-CWE-843
Access of Resource Using Incompatible Type ('Type Confusion')
CVE-2021-30588
Matching Score-6
Assigner-Chrome
ShareView Details
Matching Score-6
Assigner-Chrome
CVSS Score-8.8||HIGH
EPSS-0.60% / 68.41%
||
7 Day CHG~0.00%
Published-03 Aug, 2021 | 19:41
Updated-03 Aug, 2024 | 22:40
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

Type confusion in V8 in Google Chrome prior to 92.0.4515.107 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.

Action-Not Available
Vendor-Fedora ProjectGoogle LLC
Product-chromefedoraChrome
CWE ID-CWE-843
Access of Resource Using Incompatible Type ('Type Confusion')
CVE-2021-30954
Matching Score-6
Assigner-Apple Inc.
ShareView Details
Matching Score-6
Assigner-Apple Inc.
CVSS Score-7.8||HIGH
EPSS-0.34% / 55.84%
||
7 Day CHG~0.00%
Published-24 Aug, 2021 | 18:50
Updated-03 Aug, 2024 | 22:48
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

A type confusion issue was addressed with improved memory handling. This issue is fixed in tvOS 15.2, macOS Monterey 12.1, Safari 15.2, iOS 15.2 and iPadOS 15.2, watchOS 8.3. Processing maliciously crafted web content may lead to arbitrary code execution.

Action-Not Available
Vendor-Debian GNU/LinuxFedora ProjectApple Inc.
Product-iphone_osdebian_linuxipadostvoswatchossafarifedoramacoswatchOSmacOSiOS and iPadOS
CWE ID-CWE-843
Access of Resource Using Incompatible Type ('Type Confusion')
CVE-2021-30551
Matching Score-6
Assigner-Chrome
ShareView Details
Matching Score-6
Assigner-Chrome
CVSS Score-8.8||HIGH
EPSS-67.59% / 98.51%
||
7 Day CHG~0.00%
Published-15 Jun, 2021 | 21:40
Updated-30 Jul, 2025 | 01:38
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Known KEV||Action Due Date - 2021-11-17||Apply updates per vendor instructions.

Type confusion in V8 in Google Chrome prior to 91.0.4472.101 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.

Action-Not Available
Vendor-Google LLCFedora Project
Product-fedorachromeChromeChromium V8
CWE ID-CWE-843
Access of Resource Using Incompatible Type ('Type Confusion')
CVE-2021-21224
Matching Score-6
Assigner-Chrome
ShareView Details
Matching Score-6
Assigner-Chrome
CVSS Score-8.8||HIGH
EPSS-65.44% / 98.42%
||
7 Day CHG~0.00%
Published-26 Apr, 2021 | 16:56
Updated-30 Jul, 2025 | 01:38
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Known KEV||Action Due Date - 2021-11-17||Apply updates per vendor instructions.

Type confusion in V8 in Google Chrome prior to 90.0.4430.85 allowed a remote attacker to execute arbitrary code inside a sandbox via a crafted HTML page.

Action-Not Available
Vendor-Google LLCFedora ProjectDebian GNU/Linux
Product-fedoradebian_linuxchromeChromeChromium V8
CWE ID-CWE-843
Access of Resource Using Incompatible Type ('Type Confusion')
CVE-2020-6512
Matching Score-6
Assigner-Chrome
ShareView Details
Matching Score-6
Assigner-Chrome
CVSS Score-8.8||HIGH
EPSS-4.25% / 88.33%
||
7 Day CHG~0.00%
Published-22 Jul, 2020 | 16:16
Updated-04 Aug, 2024 | 09:02
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

Type Confusion in V8 in Google Chrome prior to 84.0.4147.89 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.

Action-Not Available
Vendor-Google LLCopenSUSEFedora ProjectDebian GNU/Linux
Product-debian_linuxchromefedorabackports_sleleapChrome
CWE ID-CWE-787
Out-of-bounds Write
CWE ID-CWE-843
Access of Resource Using Incompatible Type ('Type Confusion')
CVE-2020-6382
Matching Score-6
Assigner-Chrome
ShareView Details
Matching Score-6
Assigner-Chrome
CVSS Score-8.8||HIGH
EPSS-2.90% / 85.81%
||
7 Day CHG~0.00%
Published-11 Feb, 2020 | 14:42
Updated-04 Aug, 2024 | 09:02
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

Type confusion in JavaScript in Google Chrome prior to 80.0.3987.87 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.

Action-Not Available
Vendor-Debian GNU/LinuxRed Hat, Inc.Fedora ProjectGoogle LLCopenSUSESUSE
Product-enterprise_linux_serverdebian_linuxchromelinux_enterpriseenterprise_linux_workstationfedorapackage_hubbackports_sleenterprise_linux_desktopChrome
CWE ID-CWE-843
Access of Resource Using Incompatible Type ('Type Confusion')
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