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High8.8Microsoft Server

High [CVE-2025-27740] Active Directory Certificate Services Elevation of Privilege Vulnerability

This high-severity Microsoft Server advisory covers CVE-2025-27740 affecting Windows Server 2008 R2 Service Pack 1 (Server Core installation), Windows Server 2008 Service Pack 2 (Server Core installation), Windows Server 2012 (Server Core installation).

CVE-2025-27740 Published Apr 8, 2025Updated by vendor Aug 10, 2026
CVE-2025-27740
Affected products & platforms
Microsoft ServerWindows Server
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Summary

Weak authentication in Windows Active Directory Certificate Services allows an authorized attacker to elevate privileges over a network.

Affected products named by the advisory: Windows Server 2008 R2 Service Pack 1; Windows Server 2008 R2 Service Pack 1 (Server Core installation); Windows Server 2008 Service Pack 2; Windows Server 2008 Service Pack 2 (Server Core installation); and 12 more.

Affected products named by the advisory: Windows Server 2012 (Server Core installation); Windows Server 2012 R2 (Server Core installation); Windows Server 2016 (Server Core installation); Windows Server 2019 (Server Core installation); and 2 more.

Affected versions
  • Windows Server 2008 R2 Service Pack 1 6.1.7601.0 before 6.1.7601.27670
  • Windows Server 2008 R2 Service Pack 1 (Server Core installation) 6.1.7601.0 before 6.1.7601.27670
  • Windows Server 2008 Service Pack 2 6.0.6003.0 before 6.0.6003.23220
  • Windows Server 2008 Service Pack 2 (Server Core installation) 6.0.6003.0 before 6.0.6003.23220
  • Windows Server 2012 6.2.9200.0 before 6.2.9200.25423
  • Windows Server 2012 (Server Core installation) 6.2.9200.0 before 6.2.9200.25423
  • Windows Server 2012 R2 6.3.9600.0 before 6.3.9600.22523
  • Windows Server 2012 R2 (Server Core installation) 6.3.9600.0 before 6.3.9600.22523
  • Windows Server 2016 10.0.14393.0 before 10.0.14393.7969
  • Windows Server 2016 (Server Core installation) 10.0.14393.0 before 10.0.14393.7969
  • Windows Server 2019 10.0.17763.0 before 10.0.17763.7136
  • Windows Server 2019 (Server Core installation) 10.0.17763.0 before 10.0.17763.7136

Official advisory · high-confidence parse· fetched 2 hours ago·verify at source

Fixed versions
  • 6.1.7601.27670
  • 6.0.6003.23220
  • 6.2.9200.25423
  • 6.3.9600.22523
  • 10.0.14393.7969
  • 10.0.17763.7136
  • 10.0.20348.3453
  • 10.0.25398.1551
  • 10.0.26100.3775

Official advisory · high-confidence parse· fetched 2 hours ago·verify at source

Mitigation

Upgrade to a fixed release: 6.1.7601.27670, 6.0.6003.23220, 6.2.9200.25423, 6.3.9600.22523, 10.0.14393.7969, 10.0.17763.7136. That is the remediation for this advisory.

The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.

Official advisory · high-confidence parse· fetched 2 hours ago·verify at source

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