Local SYSTEM escalation via kernel heap overflow
Published Feb 11, 2025 · Updated Feb 13, 2026
Heap-based buffer overflow in Microsoft's Kernel Streaming WOW Thunk Service Driver allows local users to gain SYSTEM privileges. Microsoft attributes the flaw to improper input validation but has not disclosed the exact request field or unsafe heap operation. Exploitation requires low-privileged local access and grants complete control of the affected Windows host.
Summary
What happened
Heap-based buffer overflow in Microsoft's Kernel Streaming WOW Thunk Service Driver allows local users to gain SYSTEM privileges. Microsoft attributes the flaw to improper input validation but has not disclosed the exact request field or unsafe heap operation. Exploitation requires low-privileged local access and grants complete control of the affected Windows host.
The record
- CVE
- CVE-2025-21375
- Published
- Feb 11, 2025
- Updated
- Feb 13, 2026
- Vendor
- Microsoft
- Product
- Windows 10 Version 1507
- Classifications
- CWE-122, CWE-20, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Feb 11, 2025CVE publishedPublication date reported by the CVE source.
- Feb 13, 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 <10.0.10240.20915
What conditions does exploitation require?
What is affected?
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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