CVE-2025-29842 — UrlMon Security Feature Bypass Vulnerability

Executive Summary

Acceptance of extraneous untrusted data with trusted data in UrlMon allows an unauthorized attacker to bypass a security feature over a network.

Overview

7.5

CVSS HIGH

Important

MS Severity

Not Exploited

MS Exploit Status

Less Likely

MS Exploit Likelihood

Category Security Feature Bypass

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

Released May 13 2025

Last Updated May 13 2025

Publicly Disclosed No

CISA KEV Not Listed

Known Exploits None Known

EPSS Score 0.00371 — 0.29688 percentile

NVD CVSS 7.5 HIGH — matches MSRC

CVSS Vector

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

ATTACK VECTOR

Network

ATTACK COMPLEXITY

High

PRIVILEGES REQUIRED

None

USER INTERACTION

Required

SCOPE

Unchanged

CONFIDENTIALITY

High

INTEGRITY

High

AVAILABILITY

High

EXPLOIT CODE MATURITY

Unproven

REMEDIATION LEVEL

Official Fix

REPORT CONFIDENCE

Confirmed

Temporal Score: 6.5

EPSS Score

0.00371

probability of exploitation in the next 30 days

0.29688 percentile - updated 2026-07-25

View on FIRST.org

Affected Products

22 affected products

Product	KB Article	Severity	Impact	Restart Required
Windows 10 for 32-bit Systems	`5058387 (Security Update)`	Important	Security Feature Bypass	Yes
Windows 10 for x64-based Systems	`5058387 (Security Update)`	Important	Security Feature Bypass	Yes
Windows 10 Version 1607 for 32-bit Systems	`5058383 (Security Update)`	Important	Security Feature Bypass	Yes
Windows 10 Version 1607 for x64-based Systems	`5058383 (Security Update)`	Important	Security Feature Bypass	Yes
Windows 10 Version 1809 for 32-bit Systems	`5058392 (Security Update)`	Important	Security Feature Bypass	Yes
Windows 10 Version 1809 for x64-based Systems	`5058392 (Security Update)`	Important	Security Feature Bypass	Yes
Windows 10 Version 21H2 for 32-bit Systems	`5058379 (Security Update)`	Important	Security Feature Bypass	Yes
Windows 10 Version 21H2 for ARM64-based Systems	`5058379 (Security Update)`	Important	Security Feature Bypass	Yes
Windows 10 Version 21H2 for x64-based Systems	`5058379 (Security Update)`	Important	Security Feature Bypass	Yes
Windows 10 Version 22H2 for 32-bit Systems	`5058379 (Security Update)`	Important	Security Feature Bypass	Yes
Windows 10 Version 22H2 for ARM64-based Systems	`5058379 (Security Update)`	Important	Security Feature Bypass	Yes
Windows 10 Version 22H2 for x64-based Systems	`5058379 (Security Update)`	Important	Security Feature Bypass	Yes
Windows 11 Version 22H2 for ARM64-based Systems	`5058405 (Security Update)`	Important	Security Feature Bypass	Yes
Windows 11 Version 22H2 for x64-based Systems	`5058405 (Security Update)`	Important	Security Feature Bypass	Yes
Windows 11 Version 23H2 for ARM64-based Systems	`5058405 (Security Update)`	Important	Security Feature Bypass	Yes
Windows 11 Version 23H2 for x64-based Systems	`5058405 (Security Update)`	Important	Security Feature Bypass	Yes
Windows 11 Version 24H2 for ARM64-based Systems 5058411 (Security Update) 5058497 (SecurityHotpatchUpdate) Important Security Feature Bypass 5055523 Base: 7.5 Temporal: 6.5 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 10.0.26100.4061 10.0.26100.3981 Yes None Windows 11 Version 24H2 for x64-based Systems 5058411 (Security Update) 5058497 (SecurityHotpatchUpdate) Important Security Feature Bypass 5055523 Base: 7.5 Temporal: 6.5 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 10.0.26100.4061 10.0.26100.3981 Yes None Windows Server 2016	`5058383 (Security Update)`	Important	Security Feature Bypass	Yes
Windows Server 2016 (Server Core installation)	`5058383 (Security Update)`	Important	Security Feature Bypass	Yes
Windows Server 2019	`5058392 (Security Update)`	Important	Security Feature Bypass	Yes
Windows Server 2019 (Server Core installation)	`5058392 (Security Update)`	Important	Security Feature Bypass	Yes
Windows Server 2022 5058385 (Security Update) 5058500 (SecurityHotpatchUpdate) Important Security Feature Bypass 5055526 Base: 7.5 Temporal: 6.5 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 10.0.20348.3692 10.0.20348.3630 Yes None Windows Server 2022 (Server Core installation)	`5058385 (Security Update)`	Important	Security Feature Bypass	Yes
Windows Server 2022, 23H2 Edition (Server Core installation)	`5058384 (Security Update)`	Important	Security Feature Bypass	Yes

Patches

7 patches

Article	Type	Restart
`5058387`	Security Update	Yes
`5058383`	Security Update	Yes
`5058392`	Security Update	Yes
`5058379`	Security Update	Yes
`5058405`	Security Update	Yes
`5058385`	Security Update	Yes
`5058384`	Security Update	Yes

Known Exploits

No known exploits have been linked for this CVE yet. When available, exploit references will be sourced from public repositories and may be unverified, incomplete, or non-functional. Always review code carefully before use in any environment.

Acknowledgments

Felix Boulet

References

MSRC Advisory MITRE NVD