Microsoft Outlook Improper Input Validation Vulnerability
Microsoft — Microsoft 365 Apps for Enterprise
Microsoft Outlook Remote Code Execution Vulnerability
9.8
94.7%
Vector breakdown
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
- Published
- Feb 13, 2024
- Modified
- Aug 10, 2026
- Added to KEV
- Feb 6, 2025
- Federal patch due
- Feb 27, 2025
CISA required action
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Weakness classification
Proof-of-concept & exploitation references
Weaponization
Public repositories whose name or description references CVE-2024-21413, found via a live GitHub search at request time. These are community-sourced signals, not a verified working exploit — cross-check each one before relying on it, and treat higher star counts and recent activity as (weak) corroboration, not proof.
No public GitHub repositories referencing CVE-2024-21413 were found at last check. Absence here is not proof no exploit exists — see the references below for vendor advisories and write-ups.
References
Frequently asked questions
What is CVE-2024-21413?
Microsoft Outlook Remote Code Execution Vulnerability
How severe is CVE-2024-21413?
CVE-2024-21413 has a CVSS base score of 9.8 out of 10 (CVSS 3.1).
Is CVE-2024-21413 actively exploited in the wild?
Yes. CVE-2024-21413 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added Feb 6, 2025, meaning CISA has confirmed evidence of active exploitation.
What is the EPSS score for CVE-2024-21413?
94.7% - meaning FIRST.org's EPSS model estimates a 94.7% probability this vulnerability will be exploited in the wild within 30 days (100% percentile among all scored CVEs).
What type of vulnerability is CVE-2024-21413?
CVE-2024-21413 is classified under CWE-20 (CWE-20: Improper Input Validation).
Cross-checked against
Impactr finds and proves whether CVE-2024-21413 — or flaws like it — are actually reachable in your own web apps and APIs, with a reproducible exploit as evidence.