Cluster Client Failover (CCF) Elevation of Privilege Vulnerability

🔗 CVE IDs covered (1)

📋 Description

🎯 Affected products9

• Windows Server 2016
• Windows Server 2016 (Server Core installation)
• Windows Server 2019
• Windows Server 2019 (Server Core installation)
• Windows Server 2022
• Windows Server 2022 (Server Core installation)
• Windows Server 2022, 23H2 Edition (Server Core installation)
• Windows Server 2025
• Windows Server 2025 (Server Core installation)

✅ Remediation

KB5075904 (Security Update) — fixed build 10.0.17763.8389 KB5075906 (Security Update) — fixed build 10.0.20348.4773 KB5075943 (Security Hotpatch Update) — fixed build 10.0.20348.4711 KB5075899 (Security Update) — fixed build 10.0.26100.32370 KB5075942 (Security Hotpatch Update) — fixed build 10.0.26100.32313 KB5075897 (Security Update) — fixed build 10.0.25398.2149 KB5075999 (Security Update) — fixed build 10.0.14393.8868

🔗 References (15)

• advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21251
• patchhttps://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5075904
• referencehttps://support.microsoft.com/help/5075904
• patchhttps://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5075906
• referencehttps://support.microsoft.com/help/5075906
• patchhttps://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5075943
• referencehttps://support.microsoft.com/help/5075943
• patchhttps://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5075899
• referencehttps://support.microsoft.com/help/5075899
• patchhttps://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5075942
• referencehttps://support.microsoft.com/help/5075942
• patchhttps://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5075897
• referencehttps://support.microsoft.com/help/5075897
• patchhttps://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5075999
• referencehttps://support.microsoft.com/help/5075999