CVE-2025-59257: Windows Local Session Manager (LSM) Denial of Service Vulnerability
Overview
- Severity
- Medium (CVSS 6.5)
- CVSS 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
- Category
- Denial of Service
- Exploit Status
- Not Exploited
- Exploitation Likelihood
- Less Likely
- Patch Tuesday
- 2025-Oct
- Released
- 2025-10-14
- EPSS Score
- 0.21% (percentile: 43.1%)
Description
Improper validation of specified type of input in Windows Local Session Manager (LSM) allows an authorized attacker to deny service over a network.
Affected Products (7)
Windows
- Windows Server 2025 (Server Core installation)
- Windows 11 Version 25H2 for ARM64-based Systems
- Windows 11 Version 25H2 for x64-based Systems
- Windows Server 2022, 23H2 Edition (Server Core installation)
- Windows 11 Version 24H2 for ARM64-based Systems
- Windows 11 Version 24H2 for x64-based Systems
- Windows Server 2025
Security Updates (2)
Acknowledgments
Hussein Alrubaye with Microsoft
Revision History
- 2025-10-14: Information published.