CVE-2024-21413

CRITICALNVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score elevated to 9.8 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2025-02-06), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 9.8 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Trending — 3 sources updated this weekExploited in the wild
9.8EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 95%CVSS: 9.8Exploit: cisa kev · ssvc active · epss top5pct · epss high · public exploitExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Microsoft Outlook Remote Code Execution Vulnerability

CVSS v3
9.8
EG Score
9.8(high)
EG Risk
99(Act)
EG Risk 99/100SSVC: Act

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation100% × 40%
Automatability100% × 15%
Action: Fix now — active exploitation, automatable, high impact.
EPSS PROB
95%
EPSS %ILE
100%
KEV
⚠ Exploited

Published

February 13, 2024

Last Modified

October 28, 2025

Advisory Details (5)

Auto-updated Aug 5, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: microsoft, cisa.
cisa Patch Available🔴 Active Exploitation

Known Exploited Vulnerabilities Catalog | CISA

Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-21413
generic

CVE-2024-21413 - Critical "MonikerLink" Vulnerability Affecting Microsoft Outlook - Mitigation Script - vsociety

https://www.vicarius.io/vsociety/posts/cve-2024-21413-critical-monikerlink-vulnerability-affecting-microsoft-outlook-mitigation-script
generic

CVE-2024-21413 - Critical "MonikerLink" Vulnerability Affecting Microsoft Outlook - Detection Script - vsociety

https://www.vicarius.io/vsociety/posts/cve-2024-21413-critical-monikerlink-vulnerability-affecting-microsoft-outlook-detection-script
generic🔴 Active Exploitation

The Risks of the #MonikerLink Bug in Microsoft Outlook and the Big Picture - Check Point Research

https://research.checkpoint.com/2024/the-risks-of-the-monikerlink-bug-in-microsoft-outlook-and-the-big-picture/
microsoft Patch Available

Security Update Guide - Microsoft Security Response Center

Security Update Guide - Microsoft Security Response Center. Patch available via Microsoft Security Update

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-21413

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 83× in last 7d / 355× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 883 total refreshes for this CVE.

  1. 2026-08-08 08:10 UTCGHSA enrichment
  2. 2026-08-08 04:26 UTCGHSA enrichment
  3. 2026-08-08 00:42 UTCGHSA enrichment
  4. 2026-08-07 20:58 UTCGHSA enrichment
  5. 2026-08-07 17:14 UTCGHSA enrichment
  6. 2026-08-07 17:09 UTCCISA KEV update
  7. 2026-08-07 13:30 UTCVendor advisory
  8. 2026-08-07 13:30 UTCGHSA enrichment
  9. 2026-08-07 09:46 UTCVendor advisory
  10. 2026-08-07 09:46 UTCGHSA enrichment
  11. 2026-08-07 06:02 UTCVendor advisory
  12. 2026-08-07 06:02 UTCGHSA enrichment
  13. 2026-08-07 02:18 UTCVendor advisory
  14. 2026-08-07 02:18 UTCGHSA enrichment
  15. 2026-08-06 22:33 UTCVendor advisory
  16. 2026-08-06 22:33 UTCGHSA enrichment
  17. 2026-08-06 18:49 UTCVendor advisory
  18. 2026-08-06 18:49 UTCGHSA enrichment
  19. 2026-08-06 15:05 UTCVendor advisory
  20. 2026-08-06 15:05 UTCGHSA enrichment
  21. 2026-08-06 11:20 UTCVendor advisory
  22. 2026-08-06 11:20 UTCGHSA enrichment
  23. 2026-08-06 07:36 UTCVendor advisory
  24. 2026-08-06 07:36 UTCGHSA enrichment
  25. 2026-08-06 03:51 UTCVendor advisory
Show 75 more
  1. 2026-08-06 03:51 UTCGHSA enrichment
  2. 2026-08-06 00:07 UTCVendor advisory
  3. 2026-08-06 00:07 UTCGHSA enrichment
  4. 2026-08-05 20:23 UTCVendor advisory
  5. 2026-08-05 20:23 UTCGHSA enrichment
  6. 2026-08-05 17:25 UTCCISA KEV update
  7. 2026-08-05 16:39 UTCGHSA enrichment
  8. 2026-08-05 12:55 UTCVendor advisory
  9. 2026-08-05 12:55 UTCGHSA enrichment
  10. 2026-08-05 09:11 UTCVendor advisory
  11. 2026-08-05 09:11 UTCGHSA enrichment
  12. 2026-08-05 05:26 UTCVendor advisory
  13. 2026-08-05 05:26 UTCGHSA enrichment
  14. 2026-08-05 01:40 UTCVendor advisory
  15. 2026-08-05 01:40 UTCGHSA enrichment
  16. 2026-08-04 21:56 UTCVendor advisory
  17. 2026-08-04 21:56 UTCGHSA enrichment
  18. 2026-08-04 18:12 UTCVendor advisory
  19. 2026-08-04 18:12 UTCGHSA enrichment
  20. 2026-08-04 17:02 UTCCISA KEV update
  21. 2026-08-04 14:28 UTCVendor advisory
  22. 2026-08-04 14:28 UTCGHSA enrichment
  23. 2026-08-04 10:44 UTCVendor advisory
  24. 2026-08-04 10:43 UTCGHSA enrichment
  25. 2026-08-04 06:56 UTCVendor advisory
  26. 2026-08-04 06:55 UTCGHSA enrichment
  27. 2026-08-04 03:09 UTCVendor advisory
  28. 2026-08-04 03:09 UTCGHSA enrichment
  29. 2026-08-03 23:25 UTCGHSA enrichment
  30. 2026-08-03 19:40 UTCGHSA enrichment
  31. 2026-08-03 19:22 UTCCISA KEV update
  32. 2026-08-03 15:56 UTCGHSA enrichment
  33. 2026-08-03 12:11 UTCVendor advisory
  34. 2026-08-03 12:11 UTCGHSA enrichment
  35. 2026-08-03 08:26 UTCVendor advisory
  36. 2026-08-03 08:26 UTCGHSA enrichment
  37. 2026-08-03 04:41 UTCVendor advisory
  38. 2026-08-03 04:41 UTCGHSA enrichment
  39. 2026-08-03 00:57 UTCVendor advisory
  40. 2026-08-03 00:57 UTCGHSA enrichment
  41. 2026-08-02 21:13 UTCVendor advisory
  42. 2026-08-02 21:13 UTCGHSA enrichment
  43. 2026-08-02 17:29 UTCVendor advisory
  44. 2026-08-02 17:29 UTCGHSA enrichment
  45. 2026-08-02 13:45 UTCVendor advisory
  46. 2026-08-02 13:45 UTCGHSA enrichment
  47. 2026-08-02 10:00 UTCVendor advisory
  48. 2026-08-02 10:00 UTCGHSA enrichment
  49. 2026-08-02 06:16 UTCVendor advisory
  50. 2026-08-02 06:16 UTCGHSA enrichment
  51. 2026-08-02 02:31 UTCVendor advisory
  52. 2026-08-02 02:31 UTCGHSA enrichment
  53. 2026-08-01 22:46 UTCVendor advisory
  54. 2026-08-01 22:46 UTCGHSA enrichment
  55. 2026-08-01 19:02 UTCVendor advisory
  56. 2026-08-01 19:02 UTCGHSA enrichment
  57. 2026-08-01 15:18 UTCVendor advisory
  58. 2026-08-01 15:18 UTCGHSA enrichment
  59. 2026-08-01 11:34 UTCVendor advisory
  60. 2026-08-01 11:34 UTCGHSA enrichment
  61. 2026-08-01 07:49 UTCVendor advisory
  62. 2026-08-01 07:49 UTCGHSA enrichment
  63. 2026-08-01 04:04 UTCVendor advisory
  64. 2026-08-01 04:04 UTCGHSA enrichment
  65. 2026-08-01 00:19 UTCVendor advisory
  66. 2026-08-01 00:19 UTCGHSA enrichment
  67. 2026-07-31 20:34 UTCVendor advisory
  68. 2026-07-31 20:34 UTCGHSA enrichment
  69. 2026-07-31 16:48 UTCVendor advisory
  70. 2026-07-31 16:48 UTCGHSA enrichment
  71. 2026-07-31 13:04 UTCVendor advisory
  72. 2026-07-31 13:04 UTCGHSA enrichment
  73. 2026-07-31 09:19 UTCVendor advisory
  74. 2026-07-31 09:19 UTCGHSA enrichment
  75. 2026-07-31 05:35 UTCVendor advisory

Publicly available exploits

(10 references)

Working exploit code is in the public domain (10 GitHub PoCs). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCmmathivanan17/CVE-2024-21413
    First seen Nov 30, 2025

    Outlook exploitation

    Open source ↗
  • GitHub PoCD1se0/CVE-2024-21413-Vulnerabilidad-Outlook-LAB
    First seen Dec 4, 2024
    Open source ↗
  • GitHub PoCThemeHackers/CVE-2024-21413
    First seen Aug 31, 2024

    CVE-2024-21413 | Microsoft Outlook Remote Code Execution Vulnerability PoC

    Open source ↗
  • GitHub PoCdshabani96/CVE-2024-21413
    First seen Feb 29, 2024
    Open source ↗
  • GitHub PoCahmetkarakayaoffical/CVE-2024-21413-Microsoft-Outlook-Remote-Code-Execution-Vulnerability
    First seen Feb 23, 2024

    Bu betik, Microsoft Outlook'ta keşfedilen ve CVSS değeri 9.8 olan önemli bir güvenlik açığı olan CVE-2024-21413 için bir kavram kanıtı (PoC) sunmaktadır. MonikerLink hatası olarak adlandırılan bu güvenlik açığı, yerel NTLM bilgilerinin potansiyel sızıntısı ve uzaktan kod çalıştırma olasılığı dahil olmak üzere geniş kapsamlı etkilere sahiptir.

    Open source ↗
  • GitHub PoCMdusmandasthaheer/CVE-2024-21413-Microsoft-Outlook-Remote-Code-Execution-Vulnerability
    First seen Feb 20, 2024
    Open source ↗
  • GitHub PoCCMNatic/CVE-2024-21413
    First seen Feb 17, 2024

    CVE-2024-21413 PoC for THM Lab

    Open source ↗
  • GitHub PoCr00tb1t/CVE-2024-21413-POC
    First seen Feb 16, 2024

    Microsoft Outlook Information Disclosure Vulnerability (leak password hash) - CVE-2024-21413 POC

    Open source ↗
  • GitHub PoCxaitax/CVE-2024-21413-Microsoft-Outlook-Remote-Code-Execution-Vulnerability
    First seen Feb 16, 2024

    Microsoft-Outlook-Remote-Code-Execution-Vulnerability

    Open source ↗
  • GitHub PoCduy-31/CVE-2024-21413
    First seen Feb 15, 2024

    Microsoft Outlook Information Disclosure Vulnerability (leak password hash) - Expect Script POC

    Open source ↗

Frequently asked(6)

What is CVE-2024-21413?
CVE-2024-21413 is a critical vulnerability published on February 13, 2024. Microsoft Outlook Remote Code Execution Vulnerability
When was CVE-2024-21413 disclosed?
CVE-2024-21413 was first published in the National Vulnerability Database on February 13, 2024, with the most recent update on October 28, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2024-21413 actively exploited?
Yes. CISA added CVE-2024-21413 to the Known Exploited Vulnerabilities catalog on February 6, 2025, affecting Microsoft Office Outlook. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2024-21413?
CVE-2024-21413 has a CVSS v3 base score of 9.8 (NVD).
Which products are affected by CVE-2024-21413?
CVE-2024-21413 affects Microsoft Office Outlook. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2024-21413?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2024-21413, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2024-21413

Explore →

Is Your Infrastructure Affected by CVE-2024-21413?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs