Code execution via Excel heap corruption
Published Nov 11, 2025 · Updated Feb 26, 2026
Heap-based buffer overflow in Microsoft Excel products allows attackers to execute code when a user opens malicious input locally. Microsoft identifies Excel as the affected component but has not published the parser, input structure, or incorrect heap operation that corrupts memory. Exploitation requires user interaction and executes code in the affected user's security context.
Summary
What happened
Heap-based buffer overflow in Microsoft Excel products allows attackers to execute code when a user opens malicious input locally. Microsoft identifies Excel as the affected component but has not published the parser, input structure, or incorrect heap operation that corrupts memory. Exploitation requires user interaction and executes code in the affected user's security context.
The record
- CVE
- CVE-2025-62201
- Published
- Nov 11, 2025
- Updated
- Feb 26, 2026
- 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 11, 2025CVE publishedPublication date reported by the CVE source.
- Feb 26, 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=16.0.0 <16.103.25110922
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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