Code execution via use-after-free in crafted files
Published Jan 14, 2025 · Updated Jun 9, 2026
Use-after-free in Microsoft Access products allows local users to execute code when a victim opens a crafted database file. Microsoft identifies the weakness class but has not disclosed the freed object, affected code path, or operation that later reuses it. Successful exploitation requires user interaction and runs code in the victim's context, permitting data access, modification, or application failure.
Summary
What happened
Use-after-free in Microsoft Access products allows local users to execute code when a victim opens a crafted database file. Microsoft identifies the weakness class but has not disclosed the freed object, affected code path, or operation that later reuses it. Successful exploitation requires user interaction and runs code in the victim's context, permitting data access, modification, or application failure.
The record
- CVE
- CVE-2025-21366
- Published
- Jan 14, 2025
- Updated
- Jun 9, 2026
- Vendor
- Microsoft
- Product
- Microsoft Office 2019
- Classifications
- CWE-416, T1204.002
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jan 14, 2025CVE publishedPublication date reported by the CVE source.
- Jun 9, 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=19.0.0 <https://aka.ms/OfficeSecurityReleases
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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