CISA-confirmed known exploited vulnerability

CVE-2024-21413

Microsoft Outlook Improper Input Validation Vulnerability

Microsoft · Office Outlook

Vulnerability details

Microsoft Outlook contains an improper input validation vulnerability that allows for remote code execution. Successful exploitation of this vulnerability would allow an attacker to bypass the Office Protected View and open in editing mode rather than protected mode.

Added to CISA KEV: 2025-02-06

Ransomware campaign use: Unknown

CISA due date: 2025-02-27

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

View CISA KEV catalog View NVD record

← All vulnerabilities