Security Feature Bypass in Microsoft UrlMon



Risk High
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2025-29842
CWE-ID CWE-349
Exploitation vector Network
Public exploit N/A
Vulnerable software
 Windows
Operating systems & Components / Operating system

Windows Server
Operating systems & Components / Operating system

Vendor Microsoft

Security Bulletin

This security bulletin contains one high risk vulnerability.

1) Acceptance of Extraneous Untrusted Data With Trusted Data

EUVDB-ID: #VU109103

Risk: High

CVSSv4.0: 4.8 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2025-29842

CWE-ID: CWE-349 - Acceptance of Extraneous Untrusted Data With Trusted Data

Exploit availability: No

Description

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

The vulnerability exists due to improper input validation in UrlMon. A remote attacker can trick a victim to open a specially crafted file and bypass a security feature.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Windows: 10 21H2 10.0.19041.3920 - 11 24H2 10.0.26100.3775

Windows Server: 2012 Gold - 2025 10.0.26100.3775

CPE2.3 External links

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-29842


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.



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