Code execution via crafted workbook heap overflow
Published Aug 13, 2024 · Updated Jul 10, 2025
Heap-based buffer overflow in Microsoft Excel allows attackers to execute code when a user opens a crafted workbook in an affected Office release. Microsoft identifies the weakness but has not disclosed the affected parser or the incorrect size or bounds operation on workbook data. Exploitation requires user interaction with a malicious file and runs code in the user's security context, enabling data access and modification without a reported availability impact.
Summary
What happened
Heap-based buffer overflow in Microsoft Excel allows attackers to execute code when a user opens a crafted workbook in an affected Office release. Microsoft identifies the weakness but has not disclosed the affected parser or the incorrect size or bounds operation on workbook data. Exploitation requires user interaction with a malicious file and runs code in the user's security context, enabling data access and modification without a reported availability impact.
The record
- CVE
- CVE-2024-38170
- Published
- Aug 13, 2024
- Updated
- Jul 10, 2025
- Vendor
- Microsoft
- Product
- Microsoft Office LTSC for Mac 2021
- Classifications
- CWE-122, T1203, T1204.002
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 13, 2024CVE publishedPublication date reported by the CVE source.
- Jul 10, 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.
- Affected versionversion=16.0.1 <16.88.24081116
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.
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Technologies
Your stack
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Your stack
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