CVE-2025-29842: 
vulnerability analysis and mitigation

CVE-2025-29842 is a security vulnerability in Microsoft's UrlMon component, discovered and disclosed on May 13, 2025. The vulnerability allows an unauthorized attacker to bypass security features over a network by exploiting the acceptance of extraneous untrusted data with trusted data. This high-severity vulnerability affects multiple versions of Microsoft Windows operating systems (NVD CVE).

The vulnerability has been assigned a CVSS v3.1 base score of 7.5 (HIGH) with the vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H. It is classified under CWE-345 (Insufficient Verification of Data Authenticity) and CWE-349 (Acceptance of Extraneous Untrusted Data With Trusted Data). The vulnerability requires user interaction and can be exploited over a network, potentially leading to high impacts on confidentiality, integrity, and availability (NVD CVE).

The vulnerability affects multiple versions of Microsoft Windows systems, including Windows 10, Windows 11, and various Windows Server editions. If successfully exploited, it allows attackers to bypass security features, potentially compromising system security. The high CVSS score indicates severe potential impacts on system confidentiality, integrity, and availability (NVD CVE).

Microsoft has released security updates to address this vulnerability. Affected systems should be updated to the latest versions that include the security patch. The specific versions requiring updates include Windows 10 (multiple versions), Windows 11, and Windows Server editions (Microsoft Advisory).