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CVE-2024-21351

High CVSS 7.6 Known exploited

Published 2024-02-13 · last changed 2026-08-10 · added to CISA KEV 2024-02-13

This one is being exploited in the wild.

CISA added CVE-2024-21351 to the Known Exploited Vulnerabilities catalog on 2024-02-13. Federal agencies are required to remediate it on a deadline. If you have affected machines, this is the class of finding that moves ahead of the rest of the queue.

The fix

We hold no Microsoft remediation data for CVE-2024-21351, which normally means it is not a Windows CVE. For non-Microsoft software the fix is the vendor's own updated release, and the affected versions are listed below.

What it is

Windows SmartScreen Security Feature Bypass Vulnerability

Sources

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