CVE-2022-21920: Windows Kerberos Elevation of Privilege Vulnerability

Severity: critical (CVSS 9.0 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2022-01-11 · updated 2026-06-17

Description

Windows Kerberos Elevation of Privilege Vulnerability

Affected products

Microsoft Windows 10 Version 1607: 20h2, 21h1, 21h2, 1607, 1809, 1909
Microsoft Windows 11 version 21H2: all versions
Microsoft Windows 7: all versions
Microsoft Windows 8.1: all versions
Microsoft Windows RT 8.1: all versions
Microsoft Windows Server: 20h2, 2022
Microsoft Windows Server 2008: r2-sp1
Microsoft Windows Server 2012: r2
Microsoft Windows Server 2016: all versions
Microsoft Windows Server 2019: all versions
Microsoft Windows 10 Version 1507: from 10.0.10240.0 before 10.0.10240.19177 — fixed in 10.0.10240.19177
Microsoft Windows 10 1607: from 10.0.14393.0 before 10.0.14393.4886 — fixed in 10.0.14393.4886
Microsoft Windows 10: from 10.0.17763.0 before 10.0.17763.2452 — fixed in 10.0.17763.2452
Microsoft Windows 10 1909: from 10.0.0 before 10.0.18363.2037 — fixed in 10.0.18363.2037
Microsoft Windows 10 20H2: from 10.0.0 before 10.0.19042.1466 — fixed in 10.0.19042.1466
Microsoft Windows 10 21H1: from 10.0.0 before 10.0.19043.1466 — fixed in 10.0.19043.1466
Microsoft Windows 10: from 10.0.19043.0 before 10.0.19044.1466 — fixed in 10.0.19044.1466
Microsoft Windows 11 21H2: from 10.0.0 before 10.0.22000.434 — fixed in 10.0.22000.434
Microsoft Windows 7: from 6.1.0 before 6.1.7601.25829 — fixed in 6.1.7601.25829
Microsoft Windows 7 Service Pack 1: from 6.1.0 before 6.1.7601.25829 — fixed in 6.1.7601.25829
Microsoft Windows 8.1: from 6.3.0 before 6.3.9600.20246 — fixed in 6.3.9600.20246
Microsoft Windows Server 2008 R2 Service Pack 1: from 6.1.7601.0 before 6.1.7601.25829 — fixed in 6.1.7601.25829
Microsoft Windows Server 2008 Service Pack 2: from 6.0.6003.0 before 6.0.6003.21349 — fixed in 6.0.6003.21349
Microsoft Windows Server 2012: from 6.2.9200.0 before 6.2.9200.23584 — fixed in 6.2.9200.23584
Microsoft Windows Server 2012 R2: from 6.3.9600.0 before 6.3.9600.20246 — fixed in 6.3.9600.20246
Microsoft Windows Server 2016: from 10.0.14393.0 before 10.0.14393.4886 — fixed in 10.0.14393.4886
Microsoft Windows Server 2019: from 10.0.17763.0 before 10.0.17763.2452 — fixed in 10.0.17763.2452
Microsoft Windows Server 2022: from 10.0.20348.0 before 10.0.20348.469 — fixed in 10.0.20348.469
Microsoft Windows Server version 20H2: from 10.0.0 before 10.0.19042.1466 — fixed in 10.0.19042.1466

How to fix

Upgrade to a fixed version: Microsoft Windows 10 Version 1507 10.0.10240.19177; Microsoft Windows 10 1607 10.0.14393.4886; Microsoft Windows 10 10.0.17763.2452; Microsoft Windows 10 1909 10.0.18363.2037; Microsoft Windows 10 20H2 10.0.19042.1466; Microsoft Windows 10 21H1 10.0.19043.1466; Microsoft Windows 10 10.0.19044.1466; Microsoft Windows 11 21H2 10.0.22000.434; Microsoft Windows 7 6.1.7601.25829; Microsoft Windows 7 Service Pack 1 6.1.7601.25829; Microsoft Windows 8.1 6.3.9600.20246; Microsoft Windows Server 2008 R2 Service Pack 1 6.1.7601.25829. Check the vendor advisory for mitigations.

References

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