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CVE-2025-55229: Windows Certificate Spoofing Vulnerability

CVE-2025-55229 · published 1 year ago

Summary

An attacker could pretend to be a trusted source on a network, potentially stealing sensitive information or taking control of a system. This affects Windows systems that use certificates for authentication and encryption. Update Windows to the latest version to fix this issue.

What to do

Update microsoft windows_10_1507 to version 10.0.10240.21014 or later.
Update microsoft windows_10_1607 to version 10.0.14393.8066 or later.
Update microsoft windows_10_1809 to version 10.0.17763.7314 or later.
Update microsoft windows_10_21h2 to version 10.0.19044.5854 or later.
Update microsoft windows_10_22h2 to version 10.0.19045.5854 or later.
Update microsoft windows_11_22h2 to version 10.0.22621.5335 or later.
Update microsoft windows_11_23h2 to version 10.0.22631.5335 or later.
Update microsoft windows_11_24h2 to version 10.0.26100.4061 or later.
Update microsoft windows_server_2016 to version 10.0.14393.8066 or later.
Update microsoft windows_server_2019 to version 10.0.17763.7314 or later.
Update microsoft windows_server_2022 to version 10.0.20348.3630 or later.
Update microsoft windows_server_2022_23h2 to version 10.0.25398.1611 or later.
Update microsoft windows_server_2025 to version 10.0.26100.4061 or later.

Affected software

Vendor	Product	Affected versions
microsoft	windows_10_1507	< 10.0.10240.21014 `cpe:2.3:o:microsoft:windows_10_1507:::::::x64:*`
microsoft	windows_10_1607	< 10.0.14393.8066 `cpe:2.3:o:microsoft:windows_10_1607:::::::x64:*`
microsoft	windows_10_1809	< 10.0.17763.7314 `cpe:2.3:o:microsoft:windows_10_1809:::::::x64:*`
microsoft	windows_10_21h2	< 10.0.19044.5854 `cpe:2.3:o:microsoft:windows_10_21h2::::::::`
microsoft	windows_10_22h2	< 10.0.19045.5854 `cpe:2.3:o:microsoft:windows_10_22h2::::::::`
microsoft	windows_11_22h2	< 10.0.22621.5335 `cpe:2.3:o:microsoft:windows_11_22h2::::::::`
microsoft	windows_11_23h2	< 10.0.22631.5335 `cpe:2.3:o:microsoft:windows_11_23h2::::::::`
microsoft	windows_11_24h2	< 10.0.26100.4061 `cpe:2.3:o:microsoft:windows_11_24h2::::::::`
microsoft	windows_server_2016	< 10.0.14393.8066 `cpe:2.3:o:microsoft:windows_server_2016::::::::`
microsoft	windows_server_2019	< 10.0.17763.7314 `cpe:2.3:o:microsoft:windows_server_2019::::::::`
microsoft	windows_server_2022	< 10.0.20348.3630 `cpe:2.3:o:microsoft:windows_server_2022::::::::`
microsoft	windows_server_2022_23h2	< 10.0.25398.1611 `cpe:2.3:o:microsoft:windows_server_2022_23h2::::::::`
microsoft	windows_server_2025	< 10.0.26100.4061 `cpe:2.3:o:microsoft:windows_server_2025::::::::`

Original advisory text

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

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-55229 Vendor Advisory

Fix within

Internet-facing 14 days

Internal 60 days

Not known to be exploited
Can be exploited automatically
Gives an attacker partial control

Severity

5.3 Medium

Exploitation

<1% chance of attack within 30 days

Type

CWE-347Improper Verification of Cryptographic Signature

Timeline

Published21 Aug 2025

Updated4 Nov 2026

First seen7 Mar 2026

Sources

CVE-2025-55229 · NVD

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