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High7.1Microsoft Server

High [CVE-2025-27491] Windows Hyper-V Remote Code Execution Vulnerability

This high-severity Microsoft Server advisory covers CVE-2025-27491 affecting Windows Server 2016 (Server Core installation), Windows Server 2019 (Server Core installation), Windows Server 2022, 23H2 Edition (Server Core installation).

CVE-2025-27491 Published Apr 8, 2025Updated by vendor Aug 10, 2026
CVE-2025-27491
Affected products & platforms
Microsoft ServerWindows Server
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Summary

Use after free in Windows Hyper-V allows an authorized attacker to execute code over a network.

Affected products named by the advisory: Windows Server 2016; Windows Server 2016 (Server Core installation); Windows Server 2019; Windows Server 2019 (Server Core installation); and 4 more.

Affected products named by the advisory: Windows Server 2022, 23H2 Edition (Server Core installation); Windows Server 2025 (Server Core installation).

Affected versions
  • Windows 10 Version 1507 10.0.10240.0 before 10.0.10240.20978
  • Windows 10 Version 1607 10.0.14393.0 before 10.0.14393.7969
  • Windows 10 Version 1809 10.0.17763.0 before 10.0.17763.7136
  • Windows 10 Version 21H2 10.0.19044.0 before 10.0.19044.5737
  • Windows 10 Version 22H2 10.0.19045.0 before 10.0.19045.5737
  • Windows 11 version 22H2 10.0.22621.0 before 10.0.22621.5189
  • Windows 11 version 22H3 10.0.22631.0 before 10.0.22631.5189
  • Windows 11 Version 23H2 10.0.22631.0 before 10.0.22631.5189
  • Windows 11 Version 24H2 10.0.26100.0 before 10.0.26100.3775
  • 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

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

Fixed versions
  • 10.0.10240.20978
  • 10.0.14393.7969
  • 10.0.17763.7136
  • 10.0.19044.5737
  • 10.0.19045.5737
  • 10.0.22621.5189
  • 10.0.22631.5189
  • 10.0.26100.3775
  • 10.0.20348.3453
  • 10.0.25398.1551

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

Mitigation

Upgrade to a fixed release: 10.0.10240.20978, 10.0.14393.7969, 10.0.17763.7136, 10.0.19044.5737, 10.0.19045.5737, 10.0.22621.5189. 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

Discussion(0)

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