What’s Vulnerable › Vulnerabilities

CVE-2021-31970: Windows TCP/IP Driver Security Feature Bypass Vulnerability

• Severity: low (CVSS 2.1 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-06-08 · updated 2026-06-17
• Weakness: CWE-639

Description

Windows TCP/IP Driver Security Feature Bypass Vulnerability

Affected products

• Microsoft Windows 10 Version 1607: 20h2, 21h1, 1607, 1809, 1909, 2004
• Microsoft Windows 8.1: all versions
• Microsoft Windows RT 8.1: all versions
• Microsoft Windows Server 2012: r2
• Microsoft Windows Server 2016: 20h2, 2004
• Microsoft Windows Server 2019: all versions
• Microsoft Windows 10 Version 1507: from 10.0.0 before 10.0.10240.18967 — fixed in 10.0.10240.18967
• Microsoft Windows 10 1607: from 10.0.0 before 10.0.14393.4467 — fixed in 10.0.14393.4467
• Microsoft Windows 10: from 10.0.0 before 10.0.17763.1999 — fixed in 10.0.17763.1999
• Microsoft Windows 10 1909: from 10.0.0 before 10.0.18363.1621 — fixed in 10.0.18363.1621
• Microsoft Windows 10 2004: from 10.0.0 before 10.0.19041.1052 — fixed in 10.0.19041.1052
• Microsoft Windows 10 20H2: from 10.0.0 before 10.0.19042.1052 — fixed in 10.0.19042.1052
• Microsoft Windows 10 21H1: from 10.0.0 before 10.0.19043.1052 — fixed in 10.0.19043.1052
• Microsoft Windows 8.1: from 6.3.0 before 6.3.9600.20045; from 6.3.0 before 6.3.9600.20044 — fixed in 6.3.9600.20045, 6.3.9600.20044
• Microsoft Windows Server 2012: from 6.2.0 before 6.2.9200.23372 — fixed in 6.2.9200.23372
• Microsoft Windows Server 2012 R2: from 6.3.0 before 6.3.9600.20045; from 6.3.0 before 6.3.9600.20044 — fixed in 6.3.9600.20045, 6.3.9600.20044
• Microsoft Windows Server 2016: from 10.0.0 before 10.0.14393.4467 — fixed in 10.0.14393.4467
• Microsoft Windows Server 2019: from 10.0.0 before 10.0.17763.1999 — fixed in 10.0.17763.1999
• Microsoft Windows Server version 2004: from 10.0.0 before 10.0.19041.1052 — fixed in 10.0.19041.1052
• Microsoft Windows Server version 20H2: from 10.0.0 before 10.0.19042.1052 — fixed in 10.0.19042.1052

How to fix

Upgrade to a fixed version: Microsoft Windows 10 Version 1507 10.0.10240.18967; Microsoft Windows 10 1607 10.0.14393.4467; Microsoft Windows 10 10.0.17763.1999; Microsoft Windows 10 1909 10.0.18363.1621; Microsoft Windows 10 2004 10.0.19041.1052; Microsoft Windows 10 20H2 10.0.19042.1052; Microsoft Windows 10 21H1 10.0.19043.1052; Microsoft Windows 8.1 6.3.9600.20045, 6.3.9600.20044; Microsoft Windows Server 2012 6.2.9200.23372; Microsoft Windows Server 2012 R2 6.3.9600.20045, 6.3.9600.20044; Microsoft Windows Server 2016 10.0.14393.4467; Microsoft Windows Server 2019 10.0.17763.1999. Check the vendor advisory for mitigations.

References

• http://packetstormsecurity.com/files/163256/Microsoft-Windows-Filtering-Platform-Token-Access-Check-Privilege-Escalation.html
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31970
• http://packetstormsecurity.com/files/163256/Microsoft-Windows-Filtering-Platform-Token-Access-Check-Privilege-Escalation.html
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31970

Get alerted when CVE-2021-31970 or the next vulnerability affects your stack