CVE-2025-29842

HIGH

Published May 13, 2025 Modified May 19, 2025 CWE-349 CWE-345

Description

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

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CVSS v3.1 Score

7.5

HIGH

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

Weakness Type (CWE)

CWE-349 CWE-349

CWE-345 CWE-345

Affected Products

Vendor	Product	Versions
microsoft	windows_10_1507	< 10.0.10240.21014
microsoft	windows_10_1507	< 10.0.10240.21014
microsoft	windows_10_1607	< 10.0.14393.8066
microsoft	windows_10_1607	< 10.0.14393.8066
microsoft	windows_10_1809	< 10.0.17763.7314
microsoft	windows_10_1809	< 10.0.17763.7314
microsoft	windows_10_21h2	< 10.0.19044.5854
microsoft	windows_10_21h2	< 10.0.19044.5854
microsoft	windows_10_21h2	< 10.0.19044.5854
microsoft	windows_10_22h2	< 10.0.19045.5854
microsoft	windows_10_22h2	< 10.0.19045.5854
microsoft	windows_10_22h2	< 10.0.19045.5854
microsoft	windows_11_22h2	< 10.0.22621.5335
microsoft	windows_11_22h2	< 10.0.22621.5335
microsoft	windows_11_23h2	< 10.0.22631.5335
microsoft	windows_11_23h2	< 10.0.22631.5335
microsoft	windows_11_24h2	< 10.0.26100.4061
microsoft	windows_11_24h2	< 10.0.26100.4061
microsoft	windows_server_2016	< 10.0.14393.8066
microsoft	windows_server_2019	< 10.0.17763.7314
microsoft	windows_server_2022	< 10.0.20348.3692
microsoft	windows_server_2022_23h2	< 10.0.25398.1611
microsoft	windows_server_2025	< 10.0.26100.4061

References

Advisories & Patches

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

Frequently Asked Questions

What is CVE-2025-29842? +

Acceptance of extraneous untrusted data with trusted data in UrlMon allows an unauthorized attacker to bypass a security feature over a network. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2025-29842? +

CVE-2025-29842 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-29842? +

CVE-2025-29842 affects products from microsoft, specifically: windows_10_1507, windows_10_1607, windows_10_1809, windows_10_21h2, windows_10_22h2, windows_11_22h2, windows_11_23h2, windows_11_24h2, windows_server_2016, windows_server_2019, windows_server_2022, windows_server_2022_23h2, windows_server_2025. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-29842? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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