CVE-2024-21413

Name: CVE-2024-21413
Creator: NVD / NIST
Published: 2024-02-13T18:16:00.137+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10Actively ExploitedEPSS 94.66%

Last modified Jun 17, 2026

CVE-2024-21413 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. Microsoft Outlook Remote Code Execution Vulnerability. CISA has confirmed active exploitation in the wild. EPSS estimates a 94.66% chance of exploitation in the next 30 days.

Description

Microsoft Outlook Remote Code Execution Vulnerability

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

94.66%

99.8th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by Feb 27, 2025.

Weakness Enumeration

CWE-20

Affected Software

Vendor	Product	Versions
Microsoft	365 Apps	All versions
Microsoft	Office 2016	All versions
Microsoft	Office 2019	All versions
Microsoft	Office Long Term Servicing Channel	2021

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-21413Patch, Vendor Advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-21413Patch, Vendor Advisory
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

Timeline

Published: Feb 13, 2024
Last Modified: Jun 17, 2026
Status: Analyzed

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 score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 94.66% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2024-21413?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2024-21413?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST