SB2025090991 - Denial of service in Microsoft Local Security Authority Subsystem Service (LSASS)
Published: September 9, 2025
Security Bulletin ID
SB2025090991
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Input validation error (CVE-ID: CVE-2025-53809)
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to insufficient validation of user-supplied input in Local Security Authority Subsystem Service (LSASS). A remote user can pass specially crafted input to the application and perform a denial of service (DoS) attack.
Remediation
Install update from vendor's website.