CVE-2024-21413
Actively exploited. CVE-2024-21413 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2025-02-06) — exploitation has been observed in the wild, and US federal agencies are required to remediate it under BOD 22-01. Treat patching as urgent.
Public exploit code is available. Proof-of-concept or working exploit code for CVE-2024-21413 is indexed in GitHub PoC. Expect opportunistic scanning and exploitation attempts — prioritize remediation.
[Update on March 15, 2024] Added clarification regarding NTLM challenge-responses [Update on February 22, 2024] Added recommendations and clarifications on the functioning of the vulnerability. The vulnerability CVE-2024-21413 allows an attacker to bypass security measures...
CSIRTS triage
- What
- A vulnerability allows an attacker to bypass security measures.
- Who is affected
- Users of Microsoft Outlook are affected.
- Urgency
- Remediation is urgent as the vulnerability has been exploited in the wild.
- Action
- Follow the recommendations and apply the necessary updates.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Exploitation confirmedAlready exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 100% of all EPSS-scored CVEs.
Exploit availability
Public exploit or proof-of-concept code for CVE-2024-21413 is indexed in these free datasets. Available exploit code raises real-world risk independent of the CVSS score.
- GitHub PoCPublic proof-of-concept repositories on GitHub reference this CVE.look it up ↗
Advisory coverage (2)
- criticalexploitedCVE-2024-21413: Microsoft Outlook Improper Input Validation Vulnerabilitycisa-kev · 2025-02-06
- unknownexploited[Update] Vulnerability in Microsoft Outlook (February 15, 2024)cert-fr-alerte · 2024-02-15
External references
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[](https://www.csirts.com/cve/CVE-2024-21413)