CVE-2026-70575: Windows Schannel Denial of Service Vulnerability
Null pointer dereference in Windows Schannel allows an authorized attacker to deny service over a network.
Other sources
Windows Schannel Denial of Service Vulnerability
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.28000.2954Patch KB5124012 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26100.33438Patch KB5122871 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26100.9445Patch KB5124008 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.20348.5622Patch KB5122882 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26200.9445Patch KB5124008 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.22631.7582Patch KB5122880
Event History
Frequently Asked Questions
What level of access does an attacker need to exploit this issue?
The attacker must be authorized and have low-level privileges. Exploitation can be performed over a network and does not require user interaction.
What is the expected impact of successful exploitation?
Successful exploitation can deny service by triggering a null pointer dereference in Windows Schannel. The provided severity vector indicates no confidentiality or integrity impact, with availability affected.
Which products are identified as affected?
The listed affected software includes Microsoft Windows 11, Microsoft Windows Server 2025, Microsoft Windows Server 2022, and Microsoft Windows Schannel.