Improper Authentication in Windows Server and Windows - CVE-2025-55340
Published: October 15, 2025
Vulnerability identifier: #VU117221
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2025-55340
CWE-ID: CWE-287
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Microsoft
Affected software:
Windows Server
Windows
Windows Server
Windows
Detailed vulnerability description
The vulnerability allows a local user to bypass authentication process.
The vulnerability exists due to an error in when processing authentication requests in Windows Remote Desktop Protocol. A local user can bypass authentication process and gain unauthorized access to the application.
How to mitigate CVE-2025-55340
Install updates from vendor's website.