CVE-2024-21413: Technical Deep-Dive (Auto Refreshed)

Generated on 2026-03-24T21:26:00.048Z. This file is automatically regenerated every 30 minutes by the CVE AI enrichment job using web sources (NVD, MITRE, CISA KEV, GitHub).

Executive Technical Summary

Microsoft Outlook Remote Code Execution Vulnerability

• Context preserved from previous revision: Microsoft Outlook Remote Code Execution Vulnerability Notes: Latest CVEs with their Proof of Concept exploits.

Technical Details

• CVE: CVE-2024-21413
• KEV date added: 2025-02-06
• KEV due date: 2025-02-27
• NVD published: 2024-02-13
• NVD modified: 2025-10-28
• MITRE modified: 2025-10-21
• CVSS base score: 9.8
• CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
• CVSS exploitability score: 3.9
• CVSS impact score: 5.9
• Attack vector: Network
• Attack complexity: Low
• Privileges required: None
• User interaction: None
• Scope: Unchanged
• Confidentiality impact: High
• Integrity impact: High
• Availability impact: High

Versions and Products Impacted

• microsoft / 365 apps
• microsoft / office 2016
• microsoft / office 2019
• microsoft / office long term servicing channel (versions: 2021)
• Microsoft / Microsoft Office 2019 (versions: 19.0.0)
• Microsoft / Microsoft 365 Apps for Enterprise (versions: 16.0.1)
• Microsoft / Microsoft Office LTSC 2021 (versions: 16.0.1)
• Microsoft / Microsoft Office 2016 (versions: 16.0.0)

Weakness Classification

• CWE-20
• NVD-CWE-noinfo

Repositories for Lab Validation (Public Examples)

• 0xMarcio/cve | stars: 1179 | updated: 2026-03-24 | https://github.com/0xMarcio/cve
  Notes: Latest CVEs with their Proof of Concept exploits.

People and Organizations Mentioned

• microsoft
• Office Outlook
• 0xMarcio

Practical Defensive Validation (Authorized Only)

1. Use only isolated environments and systems you own or are explicitly authorized to test.
2. Snapshot infrastructure before validation and preserve baseline logs (EDR, SIEM, OS, app).
3. Use microsoft / 365 apps in isolated VM snapshots (vulnerable vs patched) and compare process tree telemetry before/after updates.
4. Validate command-execution prevention policies (AppLocker/WDAC/EDR) with harmless test binaries only.
5. Create SIEM detections for suspicious parent-child chains, encoded command usage, and abnormal service creation.

References

• NVD record: https://nvd.nist.gov/vuln/detail/CVE-2024-21413
• MITRE CVE record: https://www.cve.org/CVERecord?id=CVE-2024-21413
• CISA KEV Catalog: https://www.cisa.gov/known-exploited-vulnerabilities-catalog
• CISA KEV JSON feed: https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json
• KEV notes: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-21413 ; https://nvd.nist.gov/vuln/detail/CVE-2024-21413
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-21413
• https://research.checkpoint.com/2024/the-risks-of-the-monikerlink-bug-in-microsoft-outlook-and-the-big-picture/
• https://www.vicarius.io/vsociety/posts/cve-2024-21413-critical-monikerlink-vulnerability-affecting-microsoft-outlook-detection-script
• https://www.vicarius.io/vsociety/posts/cve-2024-21413-critical-monikerlink-vulnerability-affecting-microsoft-outlook-mitigation-script
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-21413
• Repository example: https://github.com/0xMarcio/cve

This content is for defensive security training and authorized validation only.