Information disclosure in Microsoft MapUrlToZone

1) Improper Resolution of Path Equivalence

EUVDB-ID: #VU105558

Risk: Low

CVSSv4.0: 2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P/U:Clear]

CVE-ID: CVE-2025-21247

CWE-ID: CWE-41 - Improper Resolution of Path Equivalence

Exploit availability: Yes

Description

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

The vulnerability exists due to improper resolution of path equivalence in MapUrlToZone. A remote attacker can trick a victim to open a specially crafted file and gain access to sensitive information on the system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Windows Server: 2008 R2 SP1 - 2025 10.0.26100.3194

Windows: 10 21H2 10.0.19041.3920 - 11 24H2 10.0.26100.3194

CPE2.3

• cpe:2.3:o:microsoft:windows_server:2008:6.0.6003.23117:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server:2012:6.2.9200.25317:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server:2016:10.0.14393.7785:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server:2019:10.0.17763.6893:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server:2022_23H2:10.0.25398.1425:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server:2025:10.0.26100.3194:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows:10_21H2:10.0.19044.5487:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows:10_22H2:10.0.19045.5487:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows:10_1507:10.0.10240.20915:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows:10_1607:10.0.14393.7785:*:*:*:*:*:*

External links

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21247

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.