Local code execution via overflowing VHDX calculation
Published Jul 8, 2025 · Updated Feb 13, 2026
Integer overflow in Microsoft Virtual Hard Disk on affected Windows releases allows local users to execute code through a crafted VHDX file. The VHDX handler performs an overflowing integer calculation while processing attacker-controlled disk metadata, leading to heap memory corruption. Exploitation requires user interaction to open or mount the file, and successful exploitation runs code in the affected process's security context.
Summary
What happened
Integer overflow in Microsoft Virtual Hard Disk on affected Windows releases allows local users to execute code through a crafted VHDX file. The VHDX handler performs an overflowing integer calculation while processing attacker-controlled disk metadata, leading to heap memory corruption. Exploitation requires user interaction to open or mount the file, and successful exploitation runs code in the affected process's security context.
The record
- CVE
- CVE-2025-49683
- Published
- Jul 8, 2025
- Updated
- Feb 13, 2026
- Vendor
- Microsoft
- Product
- Windows 10 Version 1507
- Classifications
- CWE-122, CWE-190, T1204.002
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 8, 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 <10.0.10240.21073
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
- Microsoft Virtual Hard Disk (VHDX) 11 - Remote Code Execution (RCE)proof of concept · unverified
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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