CVE-2022-26817: Windows DNS Server Remote Code Execution Vulnerability

Severity: high (CVSS 8.5 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2022-04-15 · updated 2026-06-17
Weakness: CWE-362

Description

Windows DNS Server Remote Code Execution Vulnerability

Affected products

Microsoft Windows Server 2012: r2
Microsoft Windows Server 2016: 20h2
Microsoft Windows Server 2019: all versions
Microsoft Windows Server 2022: all versions
Microsoft Windows Server 2012 R2: from 6.3.9600.0 before 6.3.9600.20337 — fixed in 6.3.9600.20337
Microsoft Windows Server 2016: from 10.0.14393.0 before 10.0.14393.5066 — fixed in 10.0.14393.5066
Microsoft Windows Server 2019: from 10.0.17763.0 before 10.0.17763.2803 — fixed in 10.0.17763.2803
Microsoft Windows Server 2022: from 10.0.20348.0 before 10.0.20348.643 — fixed in 10.0.20348.643
Microsoft Windows Server version 20H2: from 10.0.0 before 10.0.19042.1645 — fixed in 10.0.19042.1645

How to fix

Upgrade to a fixed version: Microsoft Windows Server 2012 R2 6.3.9600.20337; Microsoft Windows Server 2016 10.0.14393.5066; Microsoft Windows Server 2019 10.0.17763.2803; Microsoft Windows Server 2022 10.0.20348.643; Microsoft Windows Server version 20H2 10.0.19042.1645. Check the vendor advisory for mitigations.

References

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