User-assisted code execution via freed-memory reuse
Published Dec 9, 2025 · Updated Apr 16, 2026
Use-after-free in Microsoft Word allows attackers to execute arbitrary code locally when a user opens a crafted Office document. Microsoft identifies freed-memory reuse in Word but has not disclosed the affected parser, object-lifetime error, or exact operation performed on document data. Exploitation requires user interaction and runs code with the user's privileges; the published record reports no authentication requirement.
Summary
What happened
Use-after-free in Microsoft Word allows attackers to execute arbitrary code locally when a user opens a crafted Office document. Microsoft identifies freed-memory reuse in Word but has not disclosed the affected parser, object-lifetime error, or exact operation performed on document data. Exploitation requires user interaction and runs code with the user's privileges; the published record reports no authentication requirement.
The record
- CVE
- CVE-2025-62558
- Published
- Dec 9, 2025
- Updated
- Apr 16, 2026
- Vendor
- Microsoft
- Product
- Microsoft Office LTSC for Mac 2024
- Classifications
- CWE-416, 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.
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Technologies
Your stack
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Your stack
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