Local AppContainer escape to elevated privileges
Published Jul 16, 2021 · Updated Aug 10, 2026
Privilege elevation in Microsoft Windows AppContainer allows local users with low privileges to gain elevated privileges. Microsoft identifies AppContainer as the affected isolation boundary but has not published the faulty component, function, or operation that permits the escape. Exploitation requires prior local low-privilege code execution and can compromise confidentiality, integrity, and availability outside the sandbox.
Summary
What happened
Privilege elevation in Microsoft Windows AppContainer allows local users with low privileges to gain elevated privileges. Microsoft identifies AppContainer as the affected isolation boundary but has not published the faulty component, function, or operation that permits the escape. Exploitation requires prior local low-privilege code execution and can compromise confidentiality, integrity, and availability outside the sandbox.
The record
- CVE
- CVE-2021-34459
- Published
- Jul 16, 2021
- Updated
- Aug 10, 2026
- Vendor
- Microsoft
- Product
- Windows 10 Version 1507
- Classifications
- CWE-269, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Jul 16, 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=10.0.10240.0 <10.0.10240.19003
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.
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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