CVE-2024-20677

Code execution via FBX use-after-free

Published Jan 9, 2024 · Updated May 3, 2025

An FBX parsing flaw in affected Microsoft Office and 3D Viewer releases allows attackers to execute code through a malicious FBX file. The parser operates on an object without first validating that the object still exists, producing a use-after-free condition. A target must open a malicious file or visit a malicious page; successful exploitation runs code with the current process's rights.

CVSS severity7.8
High
EPSS probability3.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

An FBX parsing flaw in affected Microsoft Office and 3D Viewer releases allows attackers to execute code through a malicious FBX file. The parser operates on an object without first validating that the object still exists, producing a use-after-free condition. A target must open a malicious file or visit a malicious page; successful exploitation runs code with the current process's rights.

The record

CVE
CVE-2024-20677
Published
Jan 9, 2024
Updated
May 3, 2025
Vendor
Microsoft
Product
Microsoft Office 2019
Classifications
CWE-122, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 9, 2024CVE publishedPublication date reported by the CVE source.
  2. May 3, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=19.0.0 <https://aka.ms/OfficeSecurityReleases

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Microsoft · Microsoft Office 2019version=19.0.0 <https://aka.ms/OfficeSecurityReleases
Microsoft · 3D Viewerversion=7.0.0 <7.2401.29012.0
Microsoft · Microsoft Office LTSC for Mac 2021version=16.0.1 <16.81.24011420
Microsoft · Microsoft Office LTSC 2021version=16.0.1 <https://aka.ms/OfficeSecurityReleases
Microsoft · Microsoft 365 Apps for enterpriseversion=16.0.1 <https://aka.ms/OfficeSecurityReleases

Published CVSS scores

7.8Trend Micro Zero Day InitiativeCVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-122Heap-based Buffer Overflow
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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