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CVE-2025-21334

Microsoft Windows Hyper-V NT Kernel Integration VSP Use-After-Free Vulnerability

Microsoft WindowsOperating systems
Open in ThreatlineRecord JSON
CVSS
7.8High
ExploitationExploited in the wildAdded to KEV 14 Jan 2025CISA KEV
Exploit odds (EPSS)1.57%Chance of exploitation activity in the next 30 days, higher than 75% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in10.0.19044.5371Also 10.0.19045.5371, 10.0.22621.4751 and 3 moreCVE List
Federal deadline4 Feb 2025Remediation due date for US federal agenciesCISA KEV
CISA required actionApply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. CISA KEV

What fixes it

  • 10.0.19044.5371Windows 10 Version 21H2CVE List
  • 10.0.19045.5371Windows 10 Version 22H2CVE List
  • 10.0.22621.4751Windows 11 version 22H2CVE List
  • 10.0.22631.4751Windows 11 version 22H3CVE List
  • 10.0.22631.4751Windows 11 Version 23H2CVE List
  • 10.0.26100.2894Windows 11 Version 24H2CVE List
Show all 9 fixed versions
  • 10.0.25398.1369Windows Server 2022, 23H2 Edition (Server Core installation)CVE List
  • 10.0.26100.2894Windows Server 2025CVE List
  • 10.0.26100.2894Windows Server 2025 (Server Core installation)CVE List

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Timeline

  1. 14 Jan 2025Added to CISA KEVCISA KEV
  2. 14 Jan 2025, 18:04 UTCPublishedCVE List

Description

Microsoft Windows Hyper-V NT Kernel Integration VSP contains a use-after-free vulnerability that allows a local attacker to gain SYSTEM privileges.

Text from CVE List

Affected versions 9

  • Windows 10 Version 21H2affected: 10.0.19044.0 before 10.0.19044.5371CVE List
  • Windows 10 Version 22H2affected: 10.0.19045.0 before 10.0.19045.5371CVE List
  • Windows 11 version 22H2affected: 10.0.22621.0 before 10.0.22621.4751CVE List
  • Windows 11 version 22H3affected: 10.0.22631.0 before 10.0.22631.4751CVE List
  • Windows 11 Version 23H2affected: 10.0.22631.0 before 10.0.22631.4751CVE List
  • Windows 11 Version 24H2affected: 10.0.26100.0 before 10.0.26100.2894CVE List
  • Windows Server 2022, 23H2 Edition (Server Core installation)affected: 10.0.25398.0 before 10.0.25398.1369CVE List
  • Windows Server 2025affected: 10.0.26100.0 before 10.0.26100.2894CVE List
  • Windows Server 2025 (Server Core installation)affected: 10.0.26100.0 before 10.0.26100.2894CVE List

References 4