CVE-2021-31979: Microsoft Windows Kernel Privilege Escalation Vulnerability

High severity, CVSS 7.8. Actively exploited: in CISA KEV since 2021-11-03. EPSS: 4.5% chance of exploitation in the next 30 days.

Windows Kernel Elevation of Privilege Vulnerability

Affected products

• Microsoft Windows 10 1507: before 10.0.10240.19003 (fixed in 10.0.10240.19003)
• Microsoft Windows 10 1607: before 10.0.14393.4530 (fixed in 10.0.14393.4530)
• Microsoft Windows 10 1809: before 10.0.17763.2061 (fixed in 10.0.17763.2061)
• Microsoft Windows 10 1909: before 10.0.18363.1679 (fixed in 10.0.18363.1679)
• Microsoft Windows 10 2004: before 10.0.19041.1110 (fixed in 10.0.19041.1110)
• Microsoft Windows 10 20h2: before 10.0.19042.1110 (fixed in 10.0.19042.1110)
• Microsoft Windows 10 21h1: before 10.0.19043.1110 (fixed in 10.0.19043.1110)
• Microsoft Windows 7: affected versions not specified
• Microsoft Windows 8.1: affected versions not specified
• Microsoft Windows Rt 8.1: affected versions not specified
• Microsoft Windows Server 2004: before 10.0.19041.1110 (fixed in 10.0.19041.1110)
• Microsoft Windows Server 2008: affected versions not specified; version r2 only
• Microsoft Windows Server 2012: affected versions not specified; version r2 only
• Microsoft Windows Server 2016: before 10.0.14393.4530 (fixed in 10.0.14393.4530)
• Microsoft Windows Server 2019: before 10.0.17763.2061 (fixed in 10.0.17763.2061)
• Microsoft Windows Server 20h2: before 10.0.19042.1110 (fixed in 10.0.19042.1110)

Published 2021-07-14. Last modified 2026-08-10.