Improper Authentication in Microsoft Windows and Windows Server - CVE-2025-53778

Vulnerability identifier: #VU114003

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-2025-53778

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 10.0.19044.6216, 10 22H2 10.0.19045.6216, 10 1507 10.0.10240.21100, 10 1607 10.0.14393.8330, 10 1809 10.0.17763.7678, 11 22H2 10.0.22621.5768, 11 23H2 10.0.22631.5768, 11 24H2 10.0.26100.4851, 11 24H2 10.0.26100.4946
Windows Server - addressed in versions 2008 R2 6.1.7601.27872, 2008 6.0.6003.23471, 2012 R2 6.3.9600.22725, 2012 6.2.9200.25622, 2016 10.0.14393.8330, 2019 10.0.17763.7678, 2022 23H2 10.0.25398.1791, 2022 10.0.20348.3989, 2022 10.0.20348.4052, 2025 10.0.26100.4851, 2025 10.0.26100.4946

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53778

• Improper Authentication in Microsoft Windows NTLM