#VU107242 Exposed dangerous method or function in Windows Server and Windows - CVE-2025-26651

Vulnerability identifier: #VU107242

Vulnerability risk: Medium

CVSSv4.0: 4.9 [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/E:U/U:Green]

CVE-ID: CVE-2025-26651

CWE-ID: CWE-749

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Windows Server
Operating systems & Components / Operating system
Windows
Operating systems & Components / Operating system

Vendor: Microsoft

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to the exposure of a dangerous function in Windows Local Session Manager (LSM). A remote user can cause a denial of service condition on the target system.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Windows Server: 2012 R2 6.3.9600.21871 - 2012 R2 6.3.9600.22470, 2022 10.0.20348.202 - 2022 23H2 10.0.25398.1486, 2025 10.0.26100.1742 - 2025 10.0.26100.3476

Windows: 10 1607 10.0.14393.10 - 10 1607 10.0.14393.7876, 11 22H2 10.0.22449.1000 - 11 22H2 10.0.22621.5039, 11 23H2 10.0.22631.1825 - 11 23H2 10.0.22631.5039, 11 24H2 10.0.26052.1000 - 11 24H2 10.0.26100.3476

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External links
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-26651

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.