Sensitive information disclosure through out-of-bounds read
Published Feb 11, 2025 · Updated Feb 13, 2026
Out-of-bounds read in Microsoft Excel allows attackers to disclose sensitive information after a user opens a crafted workbook. Microsoft has not published the affected parser, file structure, or the invalid bounds operation that reads beyond an allocated buffer. Exploitation requires interaction with attacker-supplied content, and the disclosed impact is limited to unintended memory disclosure.
Summary
What happened
Out-of-bounds read in Microsoft Excel allows attackers to disclose sensitive information after a user opens a crafted workbook. Microsoft has not published the affected parser, file structure, or the invalid bounds operation that reads beyond an allocated buffer. Exploitation requires interaction with attacker-supplied content, and the disclosed impact is limited to unintended memory disclosure.
The record
- CVE
- CVE-2025-21383
- Published
- Feb 11, 2025
- Updated
- Feb 13, 2026
- Vendor
- Microsoft
- Product
- Microsoft Office LTSC for Mac 2024
- Classifications
- CWE-125, T1204.002
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Feb 11, 2025CVE publishedPublication date reported by the CVE source.
- Feb 13, 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 <16.94.25020927
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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