Back to CVE records
Critical 9.8Known exploited (CISA KEV)Published Feb 13, 2024
CVE-2024-21413Microsoft Outlook Remote Code Execution Vulnerability
Updated under an hour ago ()
Does this affect you?
It affects Microsoft 365 Apps for Enterprise and 5 other products. Add what you run to find out whether that includes you.
CISA lists it as known exploited since Feb 6, 2025; federal agencies had to remediate by Feb 27, 2025. Treat that date as your deadline.
Do this next
Start free and add your stack
Free account, 1 product
Microsoft Outlook Remote Code Execution Vulnerability
- CVSS
- 9.8 CRITICAL (v3.1, CNA)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
- Weakness (CWE)
- CWE-20
- Known exploited
- Added to CISA KEV Feb 6, 2025; federal remediation due Feb 27, 2025Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
- EPSS (exploitation in the next 30 days)
- 94.66% (percentile 100)
- Assigned by
- microsoft
- NVD analysis
- Analyzed
- Record last updated
- Aug 10, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Microsoft Microsoft 365 Apps for Enterprise microsoft:365_apps_for_enterprise (from the name) | from 16.0.1 before https://aka.ms/OfficeSecurityReleases | CNA record |
Microsoft Microsoft Office 2016 microsoft:office_2016 (from the name) | from 16.0.0 before 16.0.5435.1001 | CNA record |
Microsoft Microsoft Office 2019 microsoft:office_2019 (from the name) | from 19.0.0 before https://aka.ms/OfficeSecurityReleases | CNA record |
Microsoft Microsoft Office LTSC 2021 microsoft:office_ltsc_2021 (from the name) | from 16.0.1 before https://aka.ms/OfficeSecurityReleases | CNA record |
microsoft 365_apps microsoft:365_apps | all versions | NVD |
microsoft office_2016 microsoft:office_2016 | all versions; all versions | NVD |
microsoft office_2019 microsoft:office_2019 | all versions; all versions | NVD |
microsoft office_long_term_servicing_channel microsoft:office_long_term_servicing_channel | 2021 | NVD |
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-21413vendor-advisory, patch
- https://research.checkpoint.com/2024/the-risks-of-the-monikerlink-bug-in-microsoft-outlook-and-the-big-picture/technical-description
- https://www.vicarius.io/vsociety/posts/cve-2024-21413-critical-monikerlink-vulnerability-affecting-microsoft-outlook-detection-scriptexploit
- https://www.vicarius.io/vsociety/posts/cve-2024-21413-critical-monikerlink-vulnerability-affecting-microsoft-outlook-mitigation-scriptmitigation
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-21413us-government-resource
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.