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CVE-2023-23400: Windows DNS Server Remote Code Execution Vulnerability

• Severity: high (CVSS 7.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-03-14 · updated 2026-06-17
• Weakness: CWE-122

Description

Windows DNS Server Remote Code Execution Vulnerability

Affected products

• Microsoft Windows Server 2012: r2
• Microsoft Windows Server 2016: all versions
• Microsoft Windows Server 2019: all versions
• Microsoft Windows Server 2022: all versions
• Microsoft Windows Server 2012 R2: from 6.3.9600.0 before 6.3.9600.20865 — fixed in 6.3.9600.20865
• Microsoft Windows Server 2016: from 10.0.14393.0 before 10.0.14393.5786 — fixed in 10.0.14393.5786
• Microsoft Windows Server 2019: from 10.0.17763.0 before 10.0.17763.4131 — fixed in 10.0.17763.4131
• Microsoft Windows Server 2022: from 10.0.20348.0 before 10.0.20348.1607 — fixed in 10.0.20348.1607

How to fix

Upgrade to a fixed version: Microsoft Windows Server 2012 R2 6.3.9600.20865; Microsoft Windows Server 2016 10.0.14393.5786; Microsoft Windows Server 2019 10.0.17763.4131; Microsoft Windows Server 2022 10.0.20348.1607. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-23400
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-23400

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