CVE-2025-27472: Windows Mark of the Web Security Feature Bypass Vulnerability

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-04-08 · updated 2026-08-10
Weakness: CWE-693

Description

Protection mechanism failure in Windows Mark of the Web (MOTW) allows an unauthorized attacker to bypass a security feature over a network.

Affected products

Microsoft Windows 10 Version 1507: before 10.0.10240.20978 — fixed in 10.0.10240.20978
Microsoft Windows Server 2012: r2
Microsoft Windows 10 Version 1507: from 10.0.10240.0 before 10.0.10240.20978 — fixed in 10.0.10240.20978
Microsoft Windows Server 2012: from 6.2.9200.0 before 6.2.9200.25423 — fixed in 6.2.9200.25423
Microsoft Windows Server 2012 R2: from 6.3.9600.0 before 6.3.9600.22523 — fixed in 6.3.9600.22523

How to fix

Upgrade to a fixed version: Microsoft Windows 10 Version 1507 10.0.10240.20978; Microsoft Windows 10 Version 1507 10.0.10240.20978; Microsoft Windows Server 2012 6.2.9200.25423; Microsoft Windows Server 2012 R2 6.3.9600.22523. Check the vendor advisory for mitigations.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-27472

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