Local code execution via heap buffer overflow
Published Sep 9, 2025 · Updated Sep 9, 2025
Heap-based buffer overflow in Microsoft Excel allows attackers to execute code locally through unspecified input. Microsoft has not disclosed the affected Excel parser or the incorrect memory operation beyond identifying a heap-based buffer overflow. Exploitation requires user interaction, and successful code executes with the affected user's privileges across the listed Office products.
Summary
What happened
Heap-based buffer overflow in Microsoft Excel allows attackers to execute code locally through unspecified input. Microsoft has not disclosed the affected Excel parser or the incorrect memory operation beyond identifying a heap-based buffer overflow. Exploitation requires user interaction, and successful code executes with the affected user's privileges across the listed Office products.
The record
- CVE
- CVE-2025-54900
- Published
- Sep 9, 2025
- Updated
- Sep 9, 2025
- Vendor
- Microsoft
- Product
- Microsoft Office LTSC for Mac 2024
- Classifications
- CWE-122, T1204
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 9, 2025CVE publishedPublication date reported by the CVE source.
- Sep 9, 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?
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- Affected versionversion=N/A
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.
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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