Improper Validation of Specified Type of Input in Microsoft Windows and Windows Server - CVE-2025-59257
Published: October 15, 2025
Vulnerability identifier: #VU117158
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-2025-59257
CWE-ID: CWE-1287
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 improper validation of specified type of input in Windows Local Session Manager (LSM). 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-2025-59257
Install updates from vendor's website.
Microsoft Windows - addressed in versions 10 1607 10.0.14393.8519, 11 24H2 10.0.26100.6899
Windows Server - addressed in versions 2012 R2 6.3.9600.22824, 2022 23H2 10.0.25398.1913, 2025 10.0.26100.6899
Windows Server - addressed in versions 2012 R2 6.3.9600.22824, 2022 23H2 10.0.25398.1913, 2025 10.0.26100.6899