Code execution via integer overflow
Published Feb 13, 2024 · Updated Aug 10, 2026
Integer overflow in Microsoft Word for affected Office 2016, 2019, LTSC 2021, and Microsoft 365 builds allows attackers to execute code. Microsoft identifies CWE-190 but has not published the parser, file structure, arithmetic operation, or malformed value that triggers the overflow. Exploitation requires user interaction with a crafted file and runs code in the current user's security context.
Summary
What happened
Integer overflow in Microsoft Word for affected Office 2016, 2019, LTSC 2021, and Microsoft 365 builds allows attackers to execute code. Microsoft identifies CWE-190 but has not published the parser, file structure, arithmetic operation, or malformed value that triggers the overflow. Exploitation requires user interaction with a crafted file and runs code in the current user's security context.
The record
- CVE
- CVE-2024-21379
- Published
- Feb 13, 2024
- Updated
- Aug 10, 2026
- Vendor
- Microsoft
- Product
- Microsoft Office 2019
- Classifications
- CWE-190, T1203, T1204.002
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Feb 13, 2024CVE publishedPublication date reported by the CVE source.
- Aug 10, 2026Record 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.
- Affected versionversion=19.0.0 <https://aka.ms/OfficeSecurityReleases
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Weakness, pattern, technique
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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