CVE-2021-41379: Microsoft Windows Installer Privilege Escalation Vulnerability

Medium severity, CVSS 5.5. Actively exploited: in CISA KEV since 2022-03-03. EPSS: 19.5% chance of exploitation in the next 30 days.

Windows Installer Elevation of Privilege Vulnerability

Affected products

• Microsoft Windows 10 1507: before 10.0.10240.19119 (fixed in 10.0.10240.19119)
• Microsoft Windows 10 1607: before 10.0.14393.4770 (fixed in 10.0.14393.4770)
• Microsoft Windows 10 1809: before 10.0.17763.2300 (fixed in 10.0.17763.2300)
• Microsoft Windows 10 1909: before 10.0.18363.1916 (fixed in 10.0.18363.1916)
• Microsoft Windows 10 2004: before 10.0.19041.1348 (fixed in 10.0.19041.1348)
• Microsoft Windows 10 20h2: before 10.0.19042.1348 (fixed in 10.0.19042.1348)
• Microsoft Windows 10 21h1: before 10.0.19043.1348 (fixed in 10.0.19043.1348)
• Microsoft Windows 11 21h2: before 10.0.22000.318 (fixed in 10.0.22000.318)
• 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 10.0.19041.1348 (fixed in 10.0.19041.1348)
• 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 10.0.14393.4770 (fixed in 10.0.14393.4770)
• Microsoft Windows Server 2019: before 10.0.17763.2300 (fixed in 10.0.17763.2300)
• Microsoft Windows Server 2022: before 10.0.20348.350 (fixed in 10.0.20348.350)
• Microsoft Windows Server 20h2: before 10.0.19042.1348 (fixed in 10.0.19042.1348)

Published 2021-11-10. Last modified 2026-08-19.