Description
Null pointer dereference in Windows Schannel allows an authorized attacker to deny service over a network.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Microsoft | Windows 11 version 23H2 | 10.0.22631.0 – < 10.0.22631.7582 | 10.0.22631.7582 |
| Microsoft | Windows 11 Version 24H2 | 10.0.26100.0 – < 10.0.26100.9445 | 10.0.26100.9445 |
| Microsoft | Windows 11 Version 25H2 | 10.0.26200.0 – < 10.0.26200.9445 | 10.0.26200.9445 |
| Microsoft | Windows 11 version 26H1 | 10.0.28000.0 – < 10.0.28000.2954 | 10.0.28000.2954 |
| Microsoft | Windows Server 2022 | 10.0.20348.0 – < 10.0.20348.5622 | 10.0.20348.5622 |
| Microsoft | Windows Server 2025 | 10.0.26100.0 – < 10.0.26100.33438 | 10.0.26100.33438 |
| Microsoft | Windows Server 2025 (Server Core installation) | 10.0.26100.0 – < 10.0.26100.33438 | 10.0.26100.33438 |
Advisories 2
- WID-SEC-2026-3243 Microsoft Windows: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 4, 2026
- MSRC-CVE-2026-70575 Windows Schannel Denial of Service Vulnerability Microsoft Security Response Center · Sep 8, 2026
References
- Windows Schannel Denial of Service Vulnerability vendor-advisory patch