CISA-confirmed known exploited vulnerability

CVE-2024-21351

Microsoft Windows SmartScreen Security Feature Bypass Vulnerability

Microsoft · Windows

Vulnerability details

Microsoft Windows SmartScreen contains a security feature bypass vulnerability that allows an attacker to bypass the SmartScreen user experience and inject code to potentially gain code execution, which could lead to some data exposure, lack of system availability, or both.

Added to CISA KEV: 2024-02-13

Ransomware campaign use: Unknown

CISA due date: 2024-03-05

Defensive guidance from CISA

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

This is the source's required-action field, not an independently validated patch procedure. Refer to the vendor for exact affected versions and fixes.

Source catalog date: 2026-11-06T19:44:45.1797Z · Last retrieved: 2026-11-06 21:02:26 UTC

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