CVE-2024-21413
Microsoft Outlook Remote Code Execution Vulnerability
- Critical 9.8
- Exploited: added to CISA KEV 6 Feb 2025
Description
Microsoft Outlook Remote Code Execution Vulnerability
Key facts
- Published
- 13 Feb 2024
- Last changed
- 10 Aug 2026
- Assigned by
- microsoft
- KEV added
- 6 Feb 2025
- KEV fix due
- 27 Feb 2025
- EPSS
- 94.66% likely to be exploited in the next 30 days, higher than 99.859% of CVEs (scores for 15 Nov 2026)
- SSVC (CISA)
- Exploitation: active; Automatable: yes; Technical impact: total
Severity scores
Each score is shown as its source gave it. They are not averaged or merged.
- 9.8CVSS 3.1, Criticalfrom the CNA (microsoft)
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
What to do
- Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.CISA KEV required action
Historical context and remediation
This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.
No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.
Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.
Affected products
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Microsoft 365 Apps for Enterprise |
|
| Microsoft | Microsoft Office 2016 |
|
| Microsoft | Microsoft Office 2019 |
|
| Microsoft | Microsoft Office LTSC 2021 |
|
Timeline
- 13 Feb 2024 Published
- 6 Feb 2025 CVE-2024-21413 added to CISA KEV
- 6 Feb 2025 Added to the CISA KEV catalogue