Code execution via heap buffer overflow
Published Nov 12, 2024 · Updated Jul 8, 2025
Heap-based buffer overflow in Microsoft Excel allows attackers to execute code by persuading a user to open a crafted spreadsheet. Excel mishandles untrusted spreadsheet data and writes beyond a heap buffer, but Microsoft has not identified the affected parser or malformed structure. Exploitation requires local delivery and user interaction; successful code execution runs in the user's security context.
Summary
What happened
Heap-based buffer overflow in Microsoft Excel allows attackers to execute code by persuading a user to open a crafted spreadsheet. Excel mishandles untrusted spreadsheet data and writes beyond a heap buffer, but Microsoft has not identified the affected parser or malformed structure. Exploitation requires local delivery and user interaction; successful code execution runs in the user's security context.
The record
- CVE
- CVE-2024-49030
- Published
- Nov 12, 2024
- Updated
- Jul 8, 2025
- Vendor
- Microsoft
- Product
- Microsoft Office LTSC for Mac 2024
- Classifications
- CWE-122, T1204.002, T1203
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Nov 12, 2024CVE publishedPublication date reported by the CVE source.
- Jul 8, 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=1.0.0 <16.91.24111020
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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