SYSTEM privilege escalation via VSP 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. The VSP dereferences a kernel object after its lifetime ends, allowing reused memory to redirect privileged execution. Existing low-privilege code execution on an affected Windows host is required; successful exploitation yields full local control.
Summary
What happened
Use-after-free in Microsoft Windows Hyper-V NT Kernel Integration VSP allows local users to gain SYSTEM privileges. The VSP dereferences a kernel object after its lifetime ends, allowing reused memory to redirect privileged execution. Existing low-privilege code execution on an affected Windows host is required; successful exploitation yields full local control.
The record
- CVE
- CVE-2025-21334
- 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, 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
Compare your product and version with the public record. A matching version still requires validation against your environment.
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.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Reported exploitation
- Microsoft Windows Hyper-V NT Kernel Integration VSP Use-After-Free Vulnerabilityknown exploited catalog
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo