Improper Verification of Cryptographic Signature in Microsoft Windows and Windows Server - CVE-2025-55229

Vulnerability identifier: #VU114365

CSH Severity: Medium

CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2025-55229

CWE-ID: CWE-347

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to gain access to sensitive information.

The vulnerability exists due to improper verification of cryptographic signature in Windows Certificates. A remote attacker can perform spoofing attack and gain access to sensitive information. 

Microsoft Windows
Windows Server

Install updates from vendor's website.

Microsoft Windows - addressed in versions 10 21H2 10.0.19044.6321, 10 22H2 10.0.19045.6321, 10 1507 10.0.10240.21122, 10 1607 10.0.14393.8416, 10 1809 10.0.17763.7783, 11 22H2 10.0.22621.5900, 11 23H2 10.0.22631.5900, 11 24H2 10.0.26100.6563
Windows Server - addressed in versions 2012 R2 6.3.9600.22767, 2016 10.0.14393.8416, 2019 10.0.17763.7783, 2022 23H2 10.0.25398.1840, 2022 10.0.20348.4161, 2025 10.0.26100.6563

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2025-55229

• Spoofing attack in Microsoft Windows