Sensitive information disclosure to local users
Published Sep 15, 2021 · Updated Aug 10, 2026
Information disclosure in Microsoft Office Graphics Component in Microsoft 365 Apps for enterprise allows local users to read sensitive data. Microsoft has not published the flawed function, input format, or incorrect graphics-processing operation that exposes the data. Exploitation requires low-privileged local access and no user interaction; the reported impact is bounded to disclosure and minor interruption.
Summary
What happened
Information disclosure in Microsoft Office Graphics Component in Microsoft 365 Apps for enterprise allows local users to read sensitive data. Microsoft has not published the flawed function, input format, or incorrect graphics-processing operation that exposes the data. Exploitation requires low-privileged local access and no user interaction; the reported impact is bounded to disclosure and minor interruption.
The record
- CVE
- CVE-2021-38657
- Published
- Sep 15, 2021
- Updated
- Aug 10, 2026
- Vendor
- Microsoft
- Product
- Microsoft 365 Apps for enterprise
- Classifications
- Unavailable
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Sep 15, 2021CVE publishedPublication date reported by the CVE source.
- Aug 10, 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=16.0.1 <https://aka.ms/OfficeSecurityReleases
What conditions does exploitation require?
What is affected?
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
No sourced classifications are available.
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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