SYSTEM privilege escalation for local privileged users
Published Jul 14, 2021 · Updated Aug 10, 2026
Elevation of privilege in the Windows Partition Management Driver allows local users with high privileges to gain SYSTEM rights. Microsoft has not published the vulnerable driver function or the incorrect operation it performs on attacker-controlled input. Exploitation requires local access and existing high privileges; success grants complete control of the affected Windows host.
Summary
What happened
Elevation of privilege in the Windows Partition Management Driver allows local users with high privileges to gain SYSTEM rights. Microsoft has not published the vulnerable driver function or the incorrect operation it performs on attacker-controlled input. Exploitation requires local access and existing high privileges; success grants complete control of the affected Windows host.
The record
- CVE
- CVE-2021-34493
- Published
- Jul 14, 2021
- Updated
- Aug 10, 2026
- Vendor
- Microsoft
- Product
- Windows 10 Version 1507
- Classifications
- CWE-269, T1068
- Attack vector
- local
- Privileges
- admin
Timeline
How it unfolded
- Jul 14, 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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