Information disclosure to local low-privileged users
Published Dec 15, 2021 · Updated May 28, 2026
Information disclosure in Microsoft VP9 Video Extensions allows local users with low privileges to read protected information. Microsoft has not published the affected decoder locus, the operation that mishandles data, or the specific information exposed. Exploitation requires local low-privilege access, and the published assessment limits the consequence to confidentiality without integrity or availability impact.
Summary
What happened
Information disclosure in Microsoft VP9 Video Extensions allows local users with low privileges to read protected information. Microsoft has not published the affected decoder locus, the operation that mishandles data, or the specific information exposed. Exploitation requires local low-privilege access, and the published assessment limits the consequence to confidentiality without integrity or availability impact.
The record
- CVE
- CVE-2021-43243
- Published
- Dec 15, 2021
- Updated
- May 28, 2026
- Vendor
- Microsoft
- Product
- VP9 Video Extensions
- Classifications
- Unavailable
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Dec 15, 2021CVE publishedPublication date reported by the CVE source.
- May 28, 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=N/A
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
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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