Security-feature bypass via extraneous data acceptance
Published May 13, 2025 · Updated Feb 26, 2026
Security-feature bypass in Microsoft UrlMon on affected Windows releases allows remote attackers to evade protections via crafted network data. UrlMon accepts extraneous untrusted data together with trusted data instead of rejecting or separating it, undermining the authenticity decision. Exploitation requires user interaction and specific conditions, after which protected data and service availability can be affected.
Summary
What happened
Security-feature bypass in Microsoft UrlMon on affected Windows releases allows remote attackers to evade protections via crafted network data. UrlMon accepts extraneous untrusted data together with trusted data instead of rejecting or separating it, undermining the authenticity decision. Exploitation requires user interaction and specific conditions, after which protected data and service availability can be affected.
The record
- CVE
- CVE-2025-29842
- Published
- May 13, 2025
- Updated
- Feb 26, 2026
- Vendor
- Microsoft
- Product
- Windows 10 Version 1507
- Classifications
- CWE-349, CWE-345
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- May 13, 2025CVE publishedPublication date reported by the CVE source.
- Feb 26, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=10.0.10240.0 <10.0.10240.21014
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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