CVE-2025-53809
Windows Local Security Authority Subsystem Service (LSASS) Denial of Service Vulnerability
CVSS Score
6.5
EPSS Score
0.0%
EPSS Percentile
0th
Improper input validation in Windows Local Security Authority Subsystem Service (LSASS) allows an authorized attacker to deny service over a network.
| Vendor | microsoft |
| Product | windows 11 version 24h2 |
| Ecosystems | |
| Industries | TechnologyEnterprise |
| Published | Sep 9, 2025 |
| Last Updated | Feb 20, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Affected Versions
Microsoft / Windows 11 Version 24H2
10.0.26100.0 < 10.0.26100.6584
Microsoft / Windows Server 2025
10.0.26100.0 < 10.0.26100.6584
Microsoft / Windows Server 2025 (Server Core installation)
10.0.26100.0 < 10.0.26100.6584