CVE-2021-41335: Windows Kernel Elevation of Privilege Vulnerability

Severity: high (CVSS 7.2 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-10-13 · updated 2026-06-17
Weakness: CWE-269

Description

Windows Kernel Elevation of Privilege Vulnerability

Affected products

Microsoft Windows 10 Version 1607: 20h2, 21h1, 1607, 1809, 1909, 2004
Microsoft Windows 7: all versions
Microsoft Windows 8.1: all versions
Microsoft Windows RT 8.1: all versions
Microsoft Windows Server 2008: r2-sp1
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 10.0.10240.19086 — fixed in 10.0.10240.19086
Microsoft Windows 10 1607: from 10.0.0 before 10.0.14393.4704 — fixed in 10.0.14393.4704
Microsoft Windows 10: from 10.0.0 before 10.0.17763.2237 — fixed in 10.0.17763.2237
Microsoft Windows 10 1909: from 10.0.0 before 10.0.18363.1854 — fixed in 10.0.18363.1854
Microsoft Windows 10 2004: from 10.0.0 before 10.0.19041.1288 — fixed in 10.0.19041.1288
Microsoft Windows 10 20H2: from 10.0.0 before 10.0.19042.1288 — fixed in 10.0.19042.1288
Microsoft Windows 10 21H1: from 10.0.0 before 10.0.19043.1288 — fixed in 10.0.19043.1288
Microsoft Windows 7: from 6.1.0 before 6.1.7601.25740 — fixed in 6.1.7601.25740
Microsoft Windows 7 Service Pack 1: from 6.1.0 before 6.1.7601.25740 — fixed in 6.1.7601.25740
Microsoft Windows 8.1: from 6.3.0 before 6.3.9600.20144 — fixed in 6.3.9600.20144
Microsoft Windows Server 2008 R2 Service Pack 1: from 6.1.0 before 6.1.7601.25740 — fixed in 6.1.7601.25740
Microsoft Windows Server 2012: from 6.2.0 before 6.2.9200.23490 — fixed in 6.2.9200.23490
Microsoft Windows Server 2012 R2: from 6.3.0 before 6.3.9600.20144 — fixed in 6.3.9600.20144
Microsoft Windows Server 2016: from 10.0.0 before 10.0.14393.4704 — fixed in 10.0.14393.4704
Microsoft Windows Server 2019: from 10.0.0 before 10.0.17763.2237 — fixed in 10.0.17763.2237
Microsoft Windows Server version 2004: from 10.0.0 before 10.0.19041.1288 — fixed in 10.0.19041.1288
Microsoft Windows Server version 20H2: from 10.0.0 before 10.0.19042.1288 — fixed in 10.0.19042.1288

How to fix

Upgrade to a fixed version: Microsoft Windows 10 Version 1507 10.0.10240.19086; Microsoft Windows 10 1607 10.0.14393.4704; Microsoft Windows 10 10.0.17763.2237; Microsoft Windows 10 1909 10.0.18363.1854; Microsoft Windows 10 2004 10.0.19041.1288; Microsoft Windows 10 20H2 10.0.19042.1288; Microsoft Windows 10 21H1 10.0.19043.1288; Microsoft Windows 7 6.1.7601.25740; Microsoft Windows 7 Service Pack 1 6.1.7601.25740; Microsoft Windows 8.1 6.3.9600.20144; Microsoft Windows Server 2008 R2 Service Pack 1 6.1.7601.25740; Microsoft Windows Server 2012 6.2.9200.23490. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2021-41335 or the next vulnerability affects your stack