CVE-2025-21343

Name: CVE-2025-21343
Creator: NVD / NIST
Published: 2025-01-14T18:16:00.053+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.30%

Last modified Jun 17, 2026

CVE-2025-21343 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Windows Web Threat Defense User Service Information Disclosure Vulnerability. EPSS estimates a 1.30% chance of exploitation in the next 30 days.

Description

Windows Web Threat Defense User Service Information Disclosure Vulnerability

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

1.30%

66.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-269

Affected Software

Vendor	Product	Versions
Microsoft	Windows 11 22h2	< 10.0.22621.4751
Microsoft	Windows 11 23h2	< 10.0.22631.4751
Microsoft	Windows 11 24h2	< 10.0.26100.2894

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21343Patch, Vendor Advisory

Timeline

Published: Jan 14, 2025
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2025-21343?

Windows Web Threat Defense User Service Information Disclosure Vulnerability

How severe is CVE-2025-21343?

CVE-2025-21343 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.30% probability of exploitation in the next 30 days.

How do I fix CVE-2025-21343?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-21343?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST