CVE-2021-42279 json
Chakra Scripting Engine Memory Corruption Vulnerability
published 2021-11-10 4 y ago modified 2026-08-19 2 mo ago also GHSA-jgrp-6qqq-3284 , EUVD-2022-4364
- cvss
- 7.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 2.3%
- EPSS 2.3% chance of exploitation in 30 days, percentile 83%
- public exploits
- 0
- none known
Summary
Chakra Scripting Engine Memory Corruption Vulnerability
Patch / fix
- Microsoft Windows 10 Version 1507 10.0.10240.19119
- Microsoft Windows 10 Version 1607 10.0.14393.4770
- Microsoft Windows 10 Version 1809 10.0.17763.2300
- Microsoft Windows 10 Version 1909 10.0.18363.1916
- Microsoft Windows 10 Version 2004 10.0.19041.1348
- Microsoft Windows 10 Version 20H2 10.0.19042.1348
- Microsoft Windows 10 Version 21H1 10.0.19043.1348
- Microsoft Windows 11 version 21H2 10.0.22000.318
- Microsoft Windows Server 2016 10.0.14393.4770
- Microsoft Windows Server 2019 10.0.17763.2300
- Microsoft Windows Server 2022 10.0.20348.350
- Microsoft Windows Server version 2004 10.0.19041.1348
- Microsoft Windows Server version 20H2 10.0.19042.1348
Exploit prediction
2.32% chance of exploitation in the next 30 days, higher than 83% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 4.2 | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N/E:P/RL:O/RC:C |
| CNA | 3.1 | 4.2 | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N |
| CNA | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 5.1 | AV:N/AC:H/Au:N/C:P/I:P/A:P |
| GitHub | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| nuget | Microsoft.ChakraCore | <=1.11.24 |
no fix listed |
Affected products
- Microsoft ChakraCore
- Microsoft Windows 10 Version 1507
- Microsoft Windows 10 Version 1607
- Microsoft Windows 10 Version 1809
- Microsoft Windows 10 Version 1909
- Microsoft Windows 10 Version 2004
- Microsoft Windows 10 Version 20H2
- Microsoft Windows 10 Version 21H1
- Microsoft Windows 11 version 21H2
- Microsoft Windows Server 2016
- Microsoft Windows Server 2019
- Microsoft Windows Server 2022
- Microsoft Windows Server version 2004
- Microsoft Windows Server version 20H2
Classification
- Weakness
-
- CWE-787 Out-of-bounds Write
References
-
msrc.microsoft.com
/update-guide/vulnerability/CVE-2021-42279
vendor-advisory, patch
-
portal.msrc.microsoft.com
/en-US/security-guidance/advisory/CVE-2021-42279
web, patch, vendor-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2021-42279
advisory
Sources
- CVE List CVE-2021-42279
- GitHub Advisory GHSA-jgrp-6qqq-3284
- NVD CVE-2021-42279
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.