CVE-2021-42279Chakra Scripting Engine Memory Corruption Vulnerability
- 4.2MediumCVSS base score
- 2.3%Exploitation in 30 daysEPSS · top 16% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
Chakra Scripting Engine Memory Corruption Vulnerability
Timeline
ID reserved
By microsoft
- 29 days later
· 29 days later
Published
- 5 years later
· 5 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| microsoftCNA (assigner) | 3.1 | Medium4.2 | 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 |
| NVDNVD · Modified | 3.1 | Medium4.2 | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N |
- EPSS (exploitation in 30 days)
- 2.3% · top 16% of all CVEs (12 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 4.2.
Affected products
- affected -
Microsoft · Windows 10 Version 1507
- affected 10.0.10240.0 – < 10.0.10240.19119
Microsoft · Windows 10 Version 1607
- affected 10.0.14393.0 – < 10.0.14393.4770
Microsoft · Windows 10 Version 1809
- affected 10.0.0 – < 10.0.17763.2300
Microsoft · Windows 10 Version 1809
- affected 10.0.17763.0 – < 10.0.17763.2300
Microsoft · Windows 10 Version 1909
- affected 10.0.0 – < 10.0.18363.1916
Microsoft · Windows 10 Version 2004
- affected 10.0.0 – < 10.0.19041.1348
Microsoft · Windows 10 Version 20H2
- affected 10.0.0 – < 10.0.19042.1348
Microsoft · Windows 10 Version 21H1
- affected 10.0.0 – < 10.0.19043.1348
Microsoft · Windows 11 version 21H2
- affected 10.0.22000.0 – < 10.0.22000.318
Microsoft · Windows Server 2016
- affected 10.0.14393.0 – < 10.0.14393.4770
Microsoft · Windows Server 2019
- affected 10.0.17763.0 – < 10.0.17763.2300
Microsoft · Windows Server 2022
- affected 10.0.20348.0 – < 10.0.20348.350
Microsoft · Windows Server version 2004
- affected 10.0.0 – < 10.0.19041.1348
Microsoft · Windows Server version 20H2
- affected 10.0.0 – < 10.0.19042.1348
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- NuGetMicrosoft.ChakraCoreGHSA-jgrp-6qqq-3284 (opens in a new tab)
References
References2
- Chakra Scripting Engine Memory Corruption Vulnerability (opens in a new tab)vendor-advisorypatch
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-42279 (opens in a new tab)x_refsource_MISCx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2022-4364 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-jgrp-6qqq-3284 (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2021-42279)Record last updated .