Input validation error in Microsoft Windows and Windows Server - CVE-2025-53809
Published: September 9, 2025
Vulnerability identifier: #VU115089
CSH Severity: Medium
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2025-53809
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
Microsoft Windows
Windows Server
Windows Server
How to mitigate CVE-2025-53809
Install updates from vendor's website.
Microsoft Windows - addressed in versions 10 1507 10.0.10240.21128, 11 24H2 10.0.26100.6508, 11 24H2 10.0.26100.6584
Windows Server - addressed in versions 2012 R2 6.3.9600.22774, 2025 10.0.26100.6508, 2025 10.0.26100.6584
Windows Server - addressed in versions 2012 R2 6.3.9600.22774, 2025 10.0.26100.6508, 2025 10.0.26100.6584