Local SYSTEM privilege escalation via use-after-free
Published Jan 14, 2025 · Updated Jun 9, 2026
Use-after-free in Microsoft Windows Hyper-V NT Kernel Integration VSP allows local users to gain SYSTEM privileges. Microsoft identifies the memory-lifetime error as a use-after-free in the NT Kernel Integration VSP but has not disclosed the affected function, freed object, or triggering operation. A low-privileged local account is required; successful exploitation crosses the local privilege boundary and grants full SYSTEM control.
Summary
What happened
Use-after-free in Microsoft Windows Hyper-V NT Kernel Integration VSP allows local users to gain SYSTEM privileges. Microsoft identifies the memory-lifetime error as a use-after-free in the NT Kernel Integration VSP but has not disclosed the affected function, freed object, or triggering operation. A low-privileged local account is required; successful exploitation crosses the local privilege boundary and grants full SYSTEM control.
The record
- CVE
- CVE-2025-21335
- Published
- Jan 14, 2025
- Updated
- Jun 9, 2026
- Vendor
- Microsoft
- Product
- Windows Server 2025 (Server Core installation)
- Classifications
- CWE-416, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Jan 14, 2025Exploitation reportedCISA Known Exploited Vulnerabilities catalog listing
- 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=10.0.26100.0 <10.0.26100.2894
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.
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Reported exploitation
- CISA Known Exploited Vulnerabilities catalog listingknown exploited catalog
Technologies
Your stack
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Your stack
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