Input validation error in Microsoft Windows and Windows Server - CVE-2025-27737

Vulnerability identifier: #VU107281

CSH Severity: Medium

CVSS v4: 6.2 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H]

CVE-ID: CVE-2025-27737

CWE-ID: CWE-20

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to compromise the target system.

The vulnerability exists due to insufficient validation of user-supplied input in Windows Security Zone Mapping. A remote attacker can trick a victim to click on a specially crafted URL and bypass a security feature on the system.

Microsoft Windows
Windows Server

Install updates from vendor's website.

Microsoft Windows - addressed in versions 10 21H2 10.0.19044.5737, 10 22H2 10.0.19045.5737, 10 1607 10.0.14393.7970, 10 1809 10.0.17763.7137, 11 22H2 10.0.22621.5191, 11 23H2 10.0.22631.5191, 11 24H2 10.0.26100.3775
Windows Server - addressed in versions 2008 R2 6.1.7601.27670, 2008 6.0.6003.23220, 2012 R2 6.3.9600.22523, 2012 6.2.9200.25423, 2016 10.0.14393.7970, 2019 10.0.17763.7137, 2022 23H2 10.0.25398.1551, 2022 10.0.20348.3454, 2025 10.0.26100.3775

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-27737

• Security Feature Bypass in Microsoft Windows Security Zone Mapping