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CVE PROGRAM SOURCE RECORD7.8 High

CVE-2026-21251

Cluster Client Failover (CCF) Elevation of Privilege Vulnerability

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Status
Published
Published
Updated
Assigning organization
microsoft

Description

Use after free in Windows Cluster Client Failover allows an authorized attacker to elevate privileges locally.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Microsoft Windows Server 2016

  • 10.0.14393.0 to < 10.0.14393.8868affected

Microsoft Windows Server 2016 (Server Core installation)

  • 10.0.14393.0 to < 10.0.14393.8868affected

Microsoft Windows Server 2019

  • 10.0.17763.0 to < 10.0.17763.8389affected

Microsoft Windows Server 2019 (Server Core installation)

  • 10.0.17763.0 to < 10.0.17763.8389affected

Microsoft Windows Server 2022

  • 10.0.20348.0 to < 10.0.20348.4773affected

Microsoft Windows Server 2022, 23H2 Edition (Server Core installation)

  • 10.0.25398.0 to < 10.0.25398.2149affected

Microsoft Windows Server 2025

  • 10.0.26100.0 to < 10.0.26100.32370affected

Microsoft Windows Server 2025 (Server Core installation)

  • 10.0.26100.0 to < 10.0.26100.32370affected

References