CVE-2025-59259

Name: CVE-2025-59259
Creator: NVD / NIST
Published: 2025-10-14T17:16:08.643+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 1.37%

Last modified Jun 17, 2026

CVE-2025-59259 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. Improper validation of specified type of input in Windows Local Session Manager (LSM) allows an authorized attacker to deny service over a network.. EPSS estimates a 1.37% chance of exploitation in the next 30 days.

Description

Improper validation of specified type of input in Windows Local Session Manager (LSM) allows an authorized attacker to deny service over a network.

Metrics

CVSS 3.1

6.5/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

1.37%

68.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-1287

Affected Software

Vendor	Product	Versions
Microsoft	Windows 10 1507	< 10.0.10240.21161
Microsoft	Windows 10 1607	< 10.0.14393.8519
Microsoft	Windows 10 1809	< 10.0.17763.7919
Microsoft	Windows 10 21h2	< 10.0.19044.6456
Microsoft	Windows 10 22h2	< 10.0.19045.6456
Microsoft	Windows 11 22h2	< 10.0.22621.6060
Microsoft	Windows 11 23h2	<= 10.0.22631.6060
Microsoft	Windows 11 24h2	< 10.0.26100.6899
Microsoft	Windows 11 25h2	< 10.0.26200.6899
Microsoft	Windows Server 2012	All versions
Microsoft	Windows Server 2012	r2
Microsoft	Windows Server 2016	<= 10.0.14393.8519
Microsoft	Windows Server 2019	< 10.0.17763.7919
Microsoft	Windows Server 2022	< 10.0.20348.4294
Microsoft	Windows Server 2022 23h2	< 10.0.25398.1913
Microsoft	Windows Server 2025	<= 10.0.26100.6899

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-59259Vendor Advisory

Timeline

Published: Oct 14, 2025
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2025-59259?

Improper validation of specified type of input in Windows Local Session Manager (LSM) allows an authorized attacker to deny service over a network.

How severe is CVE-2025-59259?

CVE-2025-59259 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 1.37% probability of exploitation in the next 30 days.

How do I fix CVE-2025-59259?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-59259?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST