Description

Improper resolution of path equivalence in Windows MapUrlToZone allows an unauthorized attacker to bypass a security feature over a network.

Classification

CVE ID: CVE-2025-21247

CVSS Base Severity: MEDIUM

CVSS Base Score: 4.3

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C

Affected Products

Vendor: Microsoft, Microsoft, Microsoft, Microsoft, Microsoft, Microsoft, Microsoft, Microsoft, Microsoft, Microsoft, Microsoft, Microsoft, Microsoft, Microsoft, Microsoft, Microsoft, Microsoft, Microsoft, Microsoft, Microsoft, Microsoft, Microsoft, Microsoft, Microsoft, Microsoft, Microsoft

Product: Windows Server 2025, Windows Server 2025 (Server Core installation), Windows 10 Version 1809, Windows Server 2019, Windows Server 2019 (Server Core installation), Windows Server 2022, Windows 10 Version 21H2, Windows 11 version 22H2, Windows 10 Version 22H2, Windows 11 version 22H3, Windows 11 Version 23H2, Windows Server 2022, 23H2 Edition (Server Core installation), Windows 11 Version 24H2, Windows 10 Version 1507, Windows 10 Version 1607, Windows Server 2016, Windows Server 2016 (Server Core installation), Windows Server 2008 Service Pack 2, Windows Server 2008 Service Pack 2 (Server Core installation), Windows Server 2008 Service Pack 2, Windows Server 2008 R2 Service Pack 1, Windows Server 2008 R2 Service Pack 1 (Server Core installation), Windows Server 2012, Windows Server 2012 (Server Core installation), Windows Server 2012 R2, Windows Server 2012 R2 (Server Core installation)

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.1% (probability of being exploited)

EPSS Percentile: 24.28% (scored less or equal to compared to others)

EPSS Date: 2025-04-09 (when was this score calculated)

References

https://nvd.nist.gov/vuln/detail/CVE-2025-21247
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21247

Timeline