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CVE-2021-41379: Windows Installer Elevation of Privilege Vulnerability

• Severity: medium (CVSS 4.6 v2.0)
• Exploited in the wild: yes — in CISA KEV since 2022-03-03
• EPSS: 19.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-11-10 · updated 2026-08-19
• Weakness: CWE-59

Description

Windows Installer Elevation of Privilege Vulnerability

Affected products

• Microsoft Windows 10 Version 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: 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: all versions
• Microsoft Windows 8.1: all versions
• Microsoft Windows RT 8.1: all versions
• Microsoft Windows Server 2004: before 10.0.19041.1348 — fixed in 10.0.19041.1348
• Microsoft Windows Server 2008: r2-sp1
• Microsoft Windows Server 2012: r2
• 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
• Microsoft Windows 10 Version 1507: from 10.0.10240.0 before 10.0.10240.19119 — fixed in 10.0.10240.19119
• Microsoft Windows 10 1607: from 10.0.14393.0 before 10.0.14393.4770 — fixed in 10.0.14393.4770
• Microsoft Windows 10: from 10.0.17763.0 before 10.0.17763.2300 — fixed in 10.0.17763.2300
• Microsoft Windows 10 1909: from 10.0.0 before 10.0.18363.1916 — fixed in 10.0.18363.1916
• Microsoft Windows 10 2004: from 10.0.0 before 10.0.19041.1348 — fixed in 10.0.19041.1348
• Microsoft Windows 10 20H2: from 10.0.0 before 10.0.19042.1348 — fixed in 10.0.19042.1348
• Microsoft Windows 10 21H1: from 10.0.0 before 10.0.19043.1348 — fixed in 10.0.19043.1348
• Microsoft Windows 11 21H2: from 10.0.22000.0 before 10.0.22000.318 — fixed in 10.0.22000.318
• Microsoft Windows 7: from 6.1.0 before 6.1.7601.25769 — fixed in 6.1.7601.25769
• Microsoft Windows 7 Service Pack 1: from 6.1.0 before 6.1.7601.25769 — fixed in 6.1.7601.25769
• Microsoft Windows 8.1: from 6.3.0 before 6.3.9600.20174 — fixed in 6.3.9600.20174
• Microsoft Windows Server 2008 R2 Service Pack 1: from 6.1.7601.0 before 6.1.7601.25769 — fixed in 6.1.7601.25769

How to fix

Upgrade to a fixed version: Microsoft Windows 10 Version 1507 10.0.10240.19119; Microsoft Windows 10 1607 10.0.14393.4770; Microsoft Windows 10 10.0.17763.2300; Microsoft Windows 10 1909 10.0.18363.1916; Microsoft Windows 10 2004 10.0.19041.1348; Microsoft Windows 10 20H2 10.0.19042.1348; Microsoft Windows 10 21H1 10.0.19043.1348; Microsoft Windows 11 21H2 10.0.22000.318; Microsoft Windows Server 2004 10.0.19041.1348; Microsoft Windows Server 2016 10.0.14393.4770; Microsoft Windows Server 2019 10.0.17763.2300; Microsoft Windows Server 2022 10.0.20348.350. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-41379
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-41379
• https://www.zerodayinitiative.com/advisories/ZDI-21-1308/
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-41379

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