Macro-policy bypass via untrusted-data deserialization
Published Jan 14, 2025 · Updated Jun 9, 2026
Untrusted-data deserialization in Microsoft Excel allows attackers to bypass Office macro policies after user interaction. Microsoft has not disclosed the Excel parser, serialized object, or incorrect operation that accepts the untrusted data. Public records establish the policy bypass but do not establish subsequent code execution.
Summary
What happened
Untrusted-data deserialization in Microsoft Excel allows attackers to bypass Office macro policies after user interaction. Microsoft has not disclosed the Excel parser, serialized object, or incorrect operation that accepts the untrusted data. Public records establish the policy bypass but do not establish subsequent code execution.
The record
- CVE
- CVE-2025-21364
- Published
- Jan 14, 2025
- Updated
- Jun 9, 2026
- Vendor
- Microsoft
- Product
- Microsoft Office LTSC 2024
- Classifications
- CWE-502, 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=16.0.0 <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.
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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