Code execution via untrusted pointer dereference
Published Dec 9, 2025 · Updated Apr 16, 2026
Untrusted pointer dereference in Microsoft Excel allows attackers to execute code when a user opens crafted Excel content. Microsoft has not disclosed the parser, file structure, or code path that derives and dereferences the attacker-controlled pointer. Exploitation requires user interaction but no prior privileges, and successful code runs in the affected user's security context.
Summary
What happened
Untrusted pointer dereference in Microsoft Excel allows attackers to execute code when a user opens crafted Excel content. Microsoft has not disclosed the parser, file structure, or code path that derives and dereferences the attacker-controlled pointer. Exploitation requires user interaction but no prior privileges, and successful code runs in the affected user's security context.
The record
- CVE
- CVE-2025-62556
- Published
- Dec 9, 2025
- Updated
- Apr 16, 2026
- Vendor
- Microsoft
- Product
- Microsoft Office LTSC for Mac 2024
- Classifications
- CWE-822, T1566.001, T1203, T1204.002
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Dec 9, 2025CVE publishedPublication date reported by the CVE source.
- Apr 16, 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 <16.104.25121423
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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