CVE-2025-53809

MEDIUM
2025-09-09 [email protected]
6.5
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

2
Analysis Generated
Mar 28, 2026 - 19:11 vuln.today
CVE Published
Sep 09, 2025 - 17:15 nvd
MEDIUM 6.5

Tags

Microsoft Information Disclosure Windows 11 24h2 Windows Server 2025 Windows

Description

Improper input validation in Windows Local Security Authority Subsystem Service (LSASS) allows an authorized attacker to deny service over a network.

Analysis

Improper input validation in Windows Local Security Authority Subsystem Service (LSASS) allows an authorized attacker to deny service over a network. Rated medium severity (CVSS 6.5), this vulnerability is remotely exploitable, low attack complexity. No vendor patch available.

Technical Context

This vulnerability is classified under CWE-20. Improper input validation in Windows Local Security Authority Subsystem Service (LSASS) allows an authorized attacker to deny service over a network. Affected products include: Microsoft Windows 11 24H2, Microsoft Windows Server 2025.

Affected Products

Microsoft Windows 11 24H2, Microsoft Windows Server 2025.

Remediation

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

Priority Score

33
Low Medium High Critical
KEV: 0
EPSS: +0.3
CVSS: +32
POC: 0

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CVE-2025-53809 vulnerability details – vuln.today
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