Description
Use after free in Windows Cluster Client Failover allows an authorized attacker to elevate privileges locally.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Microsoft | Windows Server 2016 | 10.0.14393.0 – < 10.0.14393.8868 | 10.0.14393.8868 |
| Microsoft | Windows Server 2016 (Server Core installation) | 10.0.14393.0 – < 10.0.14393.8868 | 10.0.14393.8868 |
| Microsoft | Windows Server 2019 | 10.0.17763.0 – < 10.0.17763.8389 | 10.0.17763.8389 |
| Microsoft | Windows Server 2019 (Server Core installation) | 10.0.17763.0 – < 10.0.17763.8389 | 10.0.17763.8389 |
| Microsoft | Windows Server 2022 | 10.0.20348.0 – < 10.0.20348.4773 | 10.0.20348.4773 |
| Microsoft | Windows Server 2022, 23H2 Edition (Server Core installation) | 10.0.25398.0 – < 10.0.25398.2149 | 10.0.25398.2149 |
| Microsoft | Windows Server 2025 | 10.0.26100.0 – < 10.0.26100.32370 | 10.0.26100.32370 |
| Microsoft | Windows Server 2025 (Server Core installation) | 10.0.26100.0 – < 10.0.26100.32370 | 10.0.26100.32370 |
Advisories 3
- WID-SEC-2026-0369 Microsoft Windows: Mehrere Schwachstellen BSI CERT-Bund (WID) · Mar 26, 2026
- NCSC-2026-0053 Kwetsbaarheden verholpen in Microsoft Windows NCSC-NL (Netherlands) · Feb 10, 2026
- MSRC-CVE-2026-21251 Cluster Client Failover (CCF) Elevation of Privilege Vulnerability Microsoft Security Response Center · Feb 10, 2026
References
- Cluster Client Failover (CCF) Elevation of Privilege Vulnerability vendor-advisory patch