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CVE-2024-43639: Windows KDC Proxy Remote Code Execution Vulnerability

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 8.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-11-12 · updated 2026-06-17
• Weakness: CWE-197

Description

Windows KDC Proxy Remote Code Execution Vulnerability

Affected products

• Microsoft Windows Server 2012: r2
• Microsoft Windows Server 2016: before 10.0.14393.7515 — fixed in 10.0.14393.7515
• Microsoft Windows Server 2019: before 10.0.17763.6532 — fixed in 10.0.17763.6532
• Microsoft Windows Server 2022: before 10.0.20348.2849 — fixed in 10.0.20348.2849
• Microsoft Windows Server 2022, 23H2 Edition (Server Core installation): before 10.0.25398.1251 — fixed in 10.0.25398.1251
• Microsoft Windows Server 2025: before 10.0.26100.2314 — fixed in 10.0.26100.2314
• Microsoft Windows Server 2012: from 6.2.9200.0 before 6.2.9200.25165 — fixed in 6.2.9200.25165
• Microsoft Windows Server 2012 R2: from 6.3.9600.0 before 6.3.9600.22267 — fixed in 6.3.9600.22267
• Microsoft Windows Server 2016: from 10.0.14393.0 before 10.0.14393.7515 — fixed in 10.0.14393.7515
• Microsoft Windows Server 2019: from 10.0.17763.0 before 10.0.17763.6532 — fixed in 10.0.17763.6532
• Microsoft Windows Server 2022: from 10.0.20348.0 before 10.0.20348.2849 — fixed in 10.0.20348.2849
• Microsoft Windows Server 2022, 23H2 Edition (Server Core installation): from 10.0.25398.0 before 10.0.25398.1251 — fixed in 10.0.25398.1251
• Microsoft Windows Server 2025: from 10.0.26100.0 before 10.0.26100.2314 — fixed in 10.0.26100.2314

How to fix

Upgrade to a fixed version: Microsoft Windows Server 2016 10.0.14393.7515; Microsoft Windows Server 2019 10.0.17763.6532; Microsoft Windows Server 2022 10.0.20348.2849; Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.1251; Microsoft Windows Server 2025 10.0.26100.2314; Microsoft Windows Server 2012 6.2.9200.25165; Microsoft Windows Server 2012 R2 6.3.9600.22267; Microsoft Windows Server 2016 10.0.14393.7515; Microsoft Windows Server 2019 10.0.17763.6532; Microsoft Windows Server 2022 10.0.20348.2849; Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.1251; Microsoft Windows Server 2025 10.0.26100.2314. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-43639

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