CVE-2021-31971
Windows HTML Platforms Security Feature Bypass Vulnerability
- Published
- Updated
- Reserved
- Assigned by
- microsoft
Description
Windows HTML Platforms Security Feature Bypass Vulnerability
Timeline
ID reserved
By microsoft
- 39 days later
· 39 days later
Published
- 3 years later
· 3 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 | Medium6.8 | 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 |
| NVDNVD · Modified | 3.1 | Medium6.8 | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N |
- EPSS (exploitation in 30 days)
- 2.1% · top 18% of all CVEs (7 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.8.
Weakness
- Security Feature Bypass
Affected products
Microsoft · Windows Server 2012 R2
- affected 6.3.0 – < 6.3.9600.20045
- affected 6.3.0 – < 1.0.0.0
Microsoft · Windows Server 2012
- affected 6.2.0 – < 6.2.9200.23372
- affected 6.2.0 – < 1.0.0.0
Microsoft · Windows 10 Version 1607
- affected 10.0.0 – < 10.0.14393.4467
- affected 6.3.0 – < 6.3.9600.20045
- affected 6.3.0 – < 1.0.0.0
- affected 6.1.0 – < 6.1.7601.25632
- affected 6.1.0 – < publication
Microsoft · Windows Server 2016
- affected 10.0.0 – < 10.0.14393.4467
Microsoft · Windows Server 2008 Service Pack 2
- affected 6.0.0 – < 6.0.6003.21137
- affected 6.0.0 – < publication
Microsoft · Windows 7 Service Pack 1
- affected 6.1.0 – < 6.1.7601.25632
- affected 6.1.0 – < publication
Microsoft · Windows 10 Version 1507
- affected 10.0.0 – < 10.0.10240.18967
Microsoft · Windows Server 2008 R2 Service Pack 1
- affected 6.1.0 – < 6.1.7601.25632
- affected 6.1.0 – < publication
Microsoft · Windows Server 2008 Service Pack 2
- affected 6.0.0 – < 6.0.6003.21137
- affected 6.0.0 – < publication
Microsoft · Windows 10 Version 21H1
- affected 10.0.0 – < 10.0.19043.1052
Microsoft · Windows 10 Version 2004
- affected 10.0.0 – < 10.0.19041.1052
Microsoft · Windows 10 Version 20H2
- affected 10.0.0 – < 10.0.19042.1052
Microsoft · Windows 10 Version 1809
- affected 10.0.0 – < 10.0.17763.1999
Microsoft · Windows Server 2019
- affected 10.0.0 – < 10.0.17763.1999
Microsoft · Windows 10 Version 1909
- affected 10.0.0 – < 10.0.18363.1621
References (1)
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31971 (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)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2021-31971)Record last updated .