CVE-2024-21413

Microsoft 365 Apps for Enterprise, Microsoft Office 2016, Microsoft Office 2019

Published 13 Feb 2024 · updated 10 Aug 2026 · Analyzed

9.8 Critical · CVSS 3.1, microsoft.com

Exploited in the wild

CISA added this to its Known Exploited Vulnerabilities catalog on 6 Feb 2025, with a remediation deadline of 27 Feb 2025 for US federal agencies.

Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Description

Microsoft Outlook Remote Code Execution Vulnerability

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2024-21413 · Patch, Vendor Advisory
research.checkpoint.com/2024/the-risks-of-the-monikerlink-bug-in-microsoft-outlook-and-the-big-picture/ · Technical Description
www.vicarius.io/vsociety/posts/cve-2024-21413-critical-monikerlink-vulnerability-affecting-microsoft-outlook-detection-script · Exploit
www.vicarius.io/vsociety/posts/cve-2024-21413-critical-monikerlink-vulnerability-affecting-microsoft-outlook-mitigation-script · Mitigation
www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-21413 · US Government Resource