ClosedCriticalPatched

Microsoft Office Outlook: Outlook Improper Input Validation Vulnerability

Microsoft Office Outlook

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 on 2025-02-06.

Why this severity: CVSS 9.8 (CNA, v3.1); actively exploited (CISA KEV)

Started: Feb 6, 2025
Closed: Feb 6, 2025
CVE: CVE-2024-21413

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Updated Feb 6, 2025

Affected

See vendor advisory / CISA notes (versions not always listed in KEV feed)

Fixed in

See vendor advisory linked in sources

Timeline1

Feb 6, 2025
CISA added CVE-2024-21413 to the KEV catalog (due 2025-02-27).

Advisories3

Notes & caveats

Derived from CISA KEV JSON feed catalogVersion 2026.10.21. CVSS from the CVE record (cvelistV5). Exact affected/fixed version strings are not always in the KEV record; verify against the vendor advisory URL. startedAt uses dateAdded (exploitation may have begun earlier; many entries are older CVEs newly confirmed as exploited in 2025).

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