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CVE-2021-24078: Windows DNS Server Remote Code Execution Vulnerability

• Severity: high (CVSS 7.5 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 11.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-02-25 · updated 2026-06-17

Description

Windows DNS Server Remote Code Execution Vulnerability

Affected products

• Microsoft Windows Server 2008: r2-sp1
• Microsoft Windows Server 2012: r2
• Microsoft Windows Server 2016: 20h2, 1909, 2004
• Microsoft Windows Server 2019: all versions
• Microsoft Windows Server 2008 R2 Service Pack 1: from 6.1.0 before publication — fixed in publication
• Microsoft Windows Server 2008 Service Pack 2: from 6.0.0 before publication — fixed in publication
• Microsoft Windows Server 2012: from 6.2.0 before publication — fixed in publication
• Microsoft Windows Server 2012 R2: from 6.3.0 before publication — fixed in publication
• Microsoft Windows Server 2016: from 10.0.0 before publication — fixed in publication
• Microsoft Windows Server 2019: from 10.0.0 before publication — fixed in publication
• Microsoft Windows Server, version 1909 (Server Core installation): from 10.0.0 before publication — fixed in publication
• Microsoft Windows Server version 2004: from 10.0.0 before publication — fixed in publication
• Microsoft Windows Server version 20H2: from 10.0.0 before publication — fixed in publication

How to fix

Upgrade to a fixed version: Microsoft Windows Server 2008 R2 Service Pack 1 publication; Microsoft Windows Server 2008 Service Pack 2 publication; Microsoft Windows Server 2012 publication; Microsoft Windows Server 2012 R2 publication; Microsoft Windows Server 2016 publication; Microsoft Windows Server 2019 publication; Microsoft Windows Server, version 1909 (Server Core installation) publication; Microsoft Windows Server version 2004 publication; Microsoft Windows Server version 20H2 publication. Check the vendor advisory for mitigations.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-24078
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-24078

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