CVE-2025-59257: Windows Local Session Manager (LSM) Denial of Service Vulnerability
Published Oct 14, 2025
·Updated
Improper validation of specified type of input in Windows Local Session Manager (LSM) allows an authorized attacker to deny service over a network.
Other sources
Windows Local Session Manager (LSM) Denial of Service Vulnerability
— Microsoft
Affected Software
11 affected componentsFixes available
Microsoft Windows Server 2025
Microsoft Windows 11=24H2
Microsoft Windows 11=25H2
Microsoft Windows 11=24H2
Microsoft Windows Server 2025
Microsoft Windows Server 2022, 23H2 Edition
Microsoft Windows 11=25H2
Microsoft Windows 11 24h2<10.0.26100.6899
Microsoft Windows 11 25h2<10.0.26200.6899
Microsoft Windows Server 2022 23h2<10.0.25398.1913
Microsoft Windows Server 2025<=10.0.26100.6899
Event History
Oct 14, 2025
CVE Published
via Microsoft·07:00 AM
Data Sourced
via Microsoft·07:00 AM
DescriptionSeverityWeakness
Data Sourced
via Microsoft·02:00 PM
Affected Software
Updated
via Microsoft·02:00 PM
Affected Software
Updated
via Microsoft·02:00 PM
Description
CVE Published
via MITRE·05:00 PM
Data Sourced
via MITRE·05:00 PM
DescriptionSeverity
Data Sourced
via NVD·05:16 PM
DescriptionSeverityWeaknessAffected Software
Frequently Asked Questions
1
What is the severity of CVE-2025-59257?
CVE-2025-59257 is rated as a significant denial of service vulnerability in Windows Local Session Manager.
2
How do I fix CVE-2025-59257?
To fix CVE-2025-59257, apply the latest security patches provided by Microsoft.
3
Which Microsoft products are affected by CVE-2025-59257?
CVE-2025-59257 affects Windows Server 2025 and specific versions of Windows 11.
4
What could an attacker achieve by exploiting CVE-2025-59257?
An attacker could exploit CVE-2025-59257 to deny service and disrupt network connectivity.
5
Is there a workaround for CVE-2025-59257 until a patch is applied?
There are no official workarounds for CVE-2025-59257, so applying the patch is essential.