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CVE-2024-21413: Microsoft Outlook Improper Input Validation Vulnerability
Microsoft Office Outlook · in CISA KEV since 2025-02-06
2025-02-06added to KEV
2025-02-27federal remediation due date
94.66%EPSS exploit probability (30 days) 99.9th percentile
9.8 CRITICALCVSS 3.1
Unknownknown ransomware use
359days from NVD publication to KEV
What it is
Microsoft Outlook contains an improper input validation vulnerability that allows for remote code execution. Successful exploitation of this vulnerability would allow an attacker to bypass the Office Protected View and open in editing mode rather than protected mode.
Required action (CISA)
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
| CWE | CWE-20 |
|---|---|
| CVSS vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD published | 2024-02-13 (Analyzed) |
Original records: NVD · CISA KEV · JSON: /api/cve/CVE-2024-21413.json · all KEV CVEs
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Get the full file: Exploited Vulnerabilities Brief – September 2026 ($29): this month's KEV additions ranked by EPSS, ransomware use and due date, ready to hand to a patch team. Checkout by Polar.