CVE-2025-55229

Windows Certificate Spoofing Vulnerability

State: Published
Severity: 5.3 Medium
Published: Aug 21, 2025
Updated: Feb 13, 2026
Reserved: Aug 11, 2025

Description

Improper verification of cryptographic signature in Windows Certificates allows an unauthorized attacker to perform spoofing over a network.

Scores

CVSS	Score	Vector	Source
3.1	5.3 Medium	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C	microsoft

Weaknesses

CWE-347 Improper Verification of Cryptographic Signature

Affected Products

Product	Versions
Windows 10 Version 1507Microsoft	10.0.10240.0 to before 10.0.10240.21014Affected
Windows 10 Version 1607Microsoft	10.0.14393.0 to before 10.0.14393.8066Affected
Windows 10 Version 1809Microsoft	10.0.17763.0 to before 10.0.17763.7314Affected
Windows 10 Version 21H2Microsoft	10.0.19044.0 to before 10.0.19044.5854Affected
Windows 10 Version 22H2Microsoft	10.0.19045.0 to before 10.0.19045.5854Affected
Windows 11 version 22H2Microsoft	10.0.22621.0 to before 10.0.22621.5335Affected
Windows 11 version 22H3Microsoft	10.0.22631.0 to before 10.0.22631.5335Affected
Windows 11 Version 23H2Microsoft	10.0.22631.0 to before 10.0.22631.5335Affected
Windows 11 Version 24H2Microsoft	10.0.26100.0 to before 10.0.26100.4061Affected
Windows Server 2016Microsoft	10.0.14393.0 to before 10.0.14393.8066Affected
Windows Server 2016 (Server Core installation)Microsoft	10.0.14393.0 to before 10.0.14393.8066Affected
Windows Server 2019Microsoft	10.0.17763.0 to before 10.0.17763.7314Affected
Windows Server 2019 (Server Core installation)Microsoft	10.0.17763.0 to before 10.0.17763.7314Affected
Windows Server 2022Microsoft	10.0.20348.0 to before 10.0.20348.3692Affected
Windows Server 2022, 23H2 Edition (Server Core installation)Microsoft	10.0.25398.0 to before 10.0.25398.1611Affected
Windows Server 2025Microsoft	10.0.26100.0 to before 10.0.26100.4061Affected
Windows Server 2025 (Server Core installation)Microsoft	10.0.26100.0 to before 10.0.26100.4061Affected

References

Windows Certificate Spoofing Vulnerabilityvendor-advisorypatch

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.