CVE-2021-31971 json
Windows HTML Platforms Security Feature Bypass Vulnerability
published 2021-06-08 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-18843
- cvss
- 8.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 2.1%
- EPSS 2.1% chance of exploitation in 30 days, percentile 81%
- public exploits
- 0
- none known
Summary
Windows HTML Platforms Security Feature Bypass Vulnerability
Patch / fix
- Microsoft Windows Server 2012 R2 1.0.0.0, 6.3.9600.20045
- Microsoft Windows Server 2012 1.0.0.0, 6.2.9200.23372
- Microsoft Windows 10 Version 1607 10.0.14393.4467
- Microsoft Windows 8.1 1.0.0.0, 6.3.9600.20045
- Microsoft Windows 7 6.1.7601.25632
- Microsoft Windows Server 2016 10.0.14393.4467
- Microsoft Windows Server 2008 Service Pack 2 6.0.6003.21137
- Microsoft Windows 7 Service Pack 1 6.1.7601.25632
- Microsoft Windows 10 Version 1507 10.0.10240.18967
- Microsoft Windows Server 2008 R2 Service Pack 1 6.1.7601.25632
- Microsoft Windows Server 2008 Service Pack 2 6.0.6003.21137
- Microsoft Windows 10 Version 21H1 10.0.19043.1052
- Microsoft Windows 10 Version 2004 10.0.19041.1052
- Microsoft Windows 10 Version 20H2 10.0.19042.1052
- Microsoft Windows 10 Version 1809 10.0.17763.1999
- Microsoft Windows Server 2019 10.0.17763.1999
- Microsoft Windows 10 Version 1909 10.0.18363.1621
Exploit prediction
2.09% chance of exploitation in the next 30 days, higher than 81% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.8 | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C |
| CNA | 3.1 | 6.8 | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N |
| CNA | 3.1 | 8.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 6.8 | AV:N/AC:M/Au:N/C:P/I:P/A:P |
Affected products
- Microsoft Windows Server 2012 R2
- Microsoft Windows Server 2012
- Microsoft Windows 10 Version 1607
- Microsoft Windows 8.1
- Microsoft Windows 7
- Microsoft Windows Server 2016
- Microsoft Windows Server 2008 Service Pack 2
- Microsoft Windows 7 Service Pack 1
- Microsoft Windows 10 Version 1507
- Microsoft Windows Server 2008 R2 Service Pack 1
- Microsoft Windows Server 2008 Service Pack 2
- Microsoft Windows 10 Version 21H1
- Microsoft Windows 10 Version 2004
- Microsoft Windows 10 Version 20H2
- Microsoft Windows 10 Version 1809
- Microsoft Windows Server 2019
- Microsoft Windows 10 Version 1909
References
-
portal.msrc.microsoft.com
/en-US/security-guidance/advisory/CVE-2021-31971
patch, vendor-advisory
Sources
- CVE List CVE-2021-31971
- NVD CVE-2021-31971
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.