Unrated severityNVD Advisory· Published Sep 9, 2025· Updated Feb 20, 2026
Windows Local Security Authority Subsystem Service (LSASS) Denial of Service Vulnerability
CVE-2025-53809
Description
Improper input validation in Windows Local Security Authority Subsystem Service (LSASS) allows an authorized attacker to deny service over a network.
Affected products
3- Microsoft/Windows 11 Version 24H2v5Range: 10.0.26100.0
- Microsoft/Windows Server 2025v5Range: 10.0.26100.0
- Microsoft/Windows Server 2025 (Server Core installation)v5Range: 10.0.26100.0
Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
1- msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53809mitrevendor-advisorypatch
News mentions
0No linked articles in our index yet.