Intelligence online17 sources monitored8 actively exploited 7d26 published 24hChecked recently
Vulnerability record

CVE-2024-21413

Microsoft Outlook Improper Input Validation Vulnerability

CriticalExploitation confirmedCISA KEV
What should I do?

This vulnerability is in the CISA Known Exploited Vulnerabilities catalog: attackers are using it. If you run Office Outlook, fix it now.

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

US federal civilian agencies must remediate by Feb 27, 2025.

Patch status

Official fix available since

Apply the vendor's update to every affected system. Check the fixed-in versions below where known.

Basis: NVD patch reference

Description

Microsoft Outlook Remote Code Execution Vulnerability

Source: NIST National Vulnerability Database. Official vulnerability data, reproduced as published.

Affected products

ProductVendorSource
Office OutlookMicrosoftKEV

Sources: KEV = CISA Known Exploited Vulnerabilities catalog. Version details have not been published yet.

Intelligence timeline

Developments from the last 30 days, newest first.

  1. CVSS scoredUpdateKEV

    CVE-2024-21413 scored CVSS 9.8: Microsoft Office Outlook, Microsoft Outlook Improper Input Validation Vulnerability

    CISA lists this as exploited in the wild. Unpatched Office Outlook systems are exposed to active attacks now.

    Basis: NIST National Vulnerability Database

  2. Patch releasedUpdateKEV

    Patch released for CVE-2024-21413: Microsoft Office Outlook, Microsoft Outlook Improper Input Validation Vulnerability

    An official fix is now available for Microsoft Office Outlook. This vulnerability is being exploited, so apply it promptly.

    Basis: NVD patch reference

1 earlier event is available with a subscription. See plans.

Coverage

We have not published a story about this vulnerability yet.

References

  • msrc.microsoft.com https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-21413
  • nvd.nist.gov https://nvd.nist.gov/vuln/detail/CVE-2024-21413
  • research.checkpoint.com https://research.checkpoint.com/2024/the-risks-of-the-monikerlink-bug-in-microsoft-outlook-and-the-big-picture…
  • vicarius.io https://www.vicarius.io/vsociety/posts/cve-2024-21413-critical-monikerlink-vulnerability-affecting-microsoft-o…
  • vicarius.io https://www.vicarius.io/vsociety/posts/cve-2024-21413-critical-monikerlink-vulnerability-affecting-microsoft-o…
  • cisa.gov https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-21413