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CVE-2024-20655: Microsoft Online Certificate Status Protocol (OCSP) Remote Code Execution Vulnerability

• Severity: medium (CVSS 6.6 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-01-09 · updated 2026-06-17
• Weakness: CWE-416

Description

Microsoft Online Certificate Status Protocol (OCSP) Remote Code Execution Vulnerability

Affected products

• Microsoft Windows Server 2008: all versions
• 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 2022, 23H2 Edition (Server Core installation): all versions
• Microsoft Windows Server 2008 R2 Service Pack 1: from 6.1.7601.0 before 6.1.7601.26910 — fixed in 6.1.7601.26910
• Microsoft Windows Server 2008 Service Pack 2: from 6.0.6003.0 before 6.0.6003.22464 — fixed in 6.0.6003.22464
• Microsoft Windows Server 2012: from 6.2.9200.0 before 6.2.9200.24664 — fixed in 6.2.9200.24664
• Microsoft Windows Server 2012 R2: from 6.3.9600.0 before 6.3.9600.21765 — fixed in 6.3.9600.21765
• Microsoft Windows Server 2016: from 10.0.14393.0 before 10.0.14393.6614 — fixed in 10.0.14393.6614
• Microsoft Windows Server 2019: from 10.0.17763.0 before 10.0.17763.5329 — fixed in 10.0.17763.5329
• Microsoft Windows Server 2022: from 10.0.20348.0 before 10.0.20348.2227 — fixed in 10.0.20348.2227
• Microsoft Windows Server 2022, 23H2 Edition (Server Core installation): from 10.0.25398.0 before 10.0.25398.643 — fixed in 10.0.25398.643

How to fix

Upgrade to a fixed version: Microsoft Windows Server 2008 R2 Service Pack 1 6.1.7601.26910; Microsoft Windows Server 2008 Service Pack 2 6.0.6003.22464; Microsoft Windows Server 2012 6.2.9200.24664; Microsoft Windows Server 2012 R2 6.3.9600.21765; Microsoft Windows Server 2016 10.0.14393.6614; Microsoft Windows Server 2019 10.0.17763.5329; Microsoft Windows Server 2022 10.0.20348.2227; Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.643. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-20655
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-20655

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