CVE-2025-53809

Windows Local Security Authority Subsystem Service (LSASS) Denial of Service Vulnerability

Published Sep 9, 2025 CVSS 3.1 · 6.5 Medium EPSS 1.6% KEV · Not listed
Description
Improper input validation in Windows Local Security Authority Subsystem Service (LSASS) allows an authorized attacker to deny service over a network.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
EUVD EUVD EUVD-2025-27321 Improper input validation in Windows Local Security Authority Subsystem Service (LSASS) allows an authorized attacker to deny service over a network.
History
Type Values Removed Values Added
Title Local Security Authority Subsystem Service (LSASS) Denial of Service Vulnerability Windows Local Security Authority Subsystem Service (LSASS) Denial of Service Vulnerability
Type Values Removed Values Added
First Time appeared Microsoft windows 11 24h2
CPEs cpe:2.3:o:microsoft:windows_11_24H2:*:*:*:*:*:*:arm64:*
Vendors & Products Microsoft windows 11 24h2
Type Values Removed Values Added
First Time appeared Microsoft windows 11 24h2
CPEs cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*
Vendors & Products Microsoft windows 11 24h2
Type Values Removed Values Added
First Time appeared Microsoft
Microsoft windows
Microsoft windows 11
Microsoft windows Server
Microsoft windows Server 2025
Vendors & Products Microsoft
Microsoft windows
Microsoft windows 11
Microsoft windows Server
Microsoft windows Server 2025
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description Improper input validation in Windows Local Security Authority Subsystem Service (LSASS) allows an authorized attacker to deny service over a network.
Title Local Security Authority Subsystem Service (LSASS) Denial of Service Vulnerability
Weaknesses CWE-20
References
Metrics cvssV3_1

{'score': 6.5, 'vector': '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
microsoft
Published
Updated
Feb 20, 2026, 4:00 PM
Reserved
Jul 9, 2025, 1:40 PM
Status
Analyzed
Published
Sep 9, 2025, 5:15 PM
Modified
Oct 18, 2026, 9:10 PM