Improper Authentication in Microsoft Windows and Windows Server - CVE-2025-54918

Vulnerability identifier: #VU115085

CSH Severity: Medium

CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2025-54918

CWE-ID: CWE-287

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists due to an error when processing authentication requests in Windows NTLM. A remote user can bypass authentication process and gain elevated privileges on the target system.

Microsoft Windows
Windows Server

Install updates from vendor's website.

Microsoft Windows - addressed in versions 10 21H2 10.0.19044.6332, 10 22H2 10.0.19045.6332, 10 1507 10.0.10240.21128, 10 1607 10.0.14393.8422, 10 1809 10.0.17763.7792, 11 22H2 10.0.22621.5909, 11 23H2 10.0.22631.5909, 11 24H2 10.0.26100.6508, 11 24H2 10.0.26100.6584
Windows Server - addressed in versions 2008 R2 6.1.7601.27929, 2008 6.0.6003.23529, 2012 R2 6.3.9600.22774, 2012 6.2.9200.25675, 2016 10.0.14393.8422, 2019 10.0.17763.7792, 2022 23H2 10.0.25398.1849, 2022 10.0.20348.4106, 2022 10.0.20348.4171, 2025 10.0.26100.6508, 2025 10.0.26100.6584

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-54918

• Privilege escalation in Microsoft Windows NTLM