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Microsoft Office

CVE-2024-20677 — Microsoft Office Remote Code Execution Vulnerability

Important CVSS 7.8 EPSS 0.0326 2024-01 archive

Executive Summary

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.

Overview

7.8
CVSS HIGH
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
Category Remote Code Execution
Released Jan 9 2024
Last Updated Jan 9 2024
Publicly Disclosed No
CISA KEV Not Listed
Known Exploits None Known
EPSS Score 0.0326 — 0.86758 percentile
NVD CVSS 7.8 HIGH — matches MSRC

CVSS 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
ATTACK VECTOR
Local
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
None
USER INTERACTION
Required
SCOPE
Unchanged
CONFIDENTIALITY
High
INTEGRITY
High
AVAILABILITY
High
EXPLOIT CODE MATURITY
Unproven
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 6.8

EPSS Score

0.0326
probability of exploitation in the next 30 days
0.86758 percentile - updated 2026-06-21
View on FIRST.org

Affected Products

8 affected products
Product KB Article Severity Impact Restart Required
3D Viewer Release Notes (Security Update) Important Remote Code Execution Maybe
Microsoft 365 Apps for Enterprise for 32-bit Systems Click to Run (Security Update) Important Remote Code Execution No
Microsoft 365 Apps for Enterprise for 64-bit Systems Click to Run (Security Update) Important Remote Code Execution No
Microsoft Office 2019 for 32-bit editions Click to Run (Security Update) Important Remote Code Execution No
Microsoft Office 2019 for 64-bit editions Click to Run (Security Update) Important Remote Code Execution No
Microsoft Office LTSC 2021 for 32-bit editions Click to Run (Security Update) Important Remote Code Execution No
Microsoft Office LTSC 2021 for 64-bit editions Click to Run (Security Update) Important Remote Code Execution No
Microsoft Office LTSC for Mac 2021 Release Notes (Security Update) Important Remote Code Execution Maybe

Patches

2 patches
Article Type Restart
Release Notes Security Update Maybe
Click to Run Security Update No

Known Exploits

Acknowledgments

Kim Dong-Uk (@justlikebono), HAO LI of VenusTech ADLab, Trend Micro Zero Day Initiative

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