CVE-2022-21984: Windows DNS Server Remote Code Execution Vulnerability

Severity: medium (CVSS 6.0 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 4.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2022-02-09 · updated 2026-06-17

Description

Windows DNS Server Remote Code Execution Vulnerability

Affected products

Microsoft Windows 10 Version 1607: 20h2, 21h1, 21h2, 1909
Microsoft Windows 11 version 21H2: all versions
Microsoft Windows Server: 20h2, 2022
Microsoft Windows 10 1909: from 10.0.0 before 10.0.18363.2094 — fixed in 10.0.18363.2094
Microsoft Windows 10 20H2: from 10.0.0 before 10.0.19042.1526 — fixed in 10.0.19042.1526
Microsoft Windows 10 21H1: from 10.0.0 before 10.0.19043.1526 — fixed in 10.0.19043.1526
Microsoft Windows 10: from 10.0.19043.0 before 10.0.19044.1526 — fixed in 10.0.19044.1526
Microsoft Windows 11 21H2: from 10.0.0 before 10.0.22000.493 — fixed in 10.0.22000.493
Microsoft Windows Server 2022: from 10.0.20348.0 before 10.0.20348.524 — fixed in 10.0.20348.524
Microsoft Windows Server version 20H2: from 10.0.0 before 10.0.19042.1526 — fixed in 10.0.19042.1526

How to fix

Upgrade to a fixed version: Microsoft Windows 10 1909 10.0.18363.2094; Microsoft Windows 10 20H2 10.0.19042.1526; Microsoft Windows 10 21H1 10.0.19043.1526; Microsoft Windows 10 10.0.19044.1526; Microsoft Windows 11 21H2 10.0.22000.493; Microsoft Windows Server 2022 10.0.20348.524; Microsoft Windows Server version 20H2 10.0.19042.1526. Check the vendor advisory for mitigations.

References

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