Authenticated service interruption via integer underflow
Published Dec 9, 2025 · Updated Apr 16, 2026
Integer underflow in Microsoft Windows Hyper-V allows remote authenticated users to interrupt the host service over a network. Microsoft has disclosed neither the affected Hyper-V component nor the untrusted value whose arithmetic wraps below zero. The attacker needs low privileges and a network path to Hyper-V; exploitation affects availability only and grants neither data access nor code execution.
Summary
What happened
Integer underflow in Microsoft Windows Hyper-V allows remote authenticated users to interrupt the host service over a network. Microsoft has disclosed neither the affected Hyper-V component nor the untrusted value whose arithmetic wraps below zero. The attacker needs low privileges and a network path to Hyper-V; exploitation affects availability only and grants neither data access nor code execution.
The record
- CVE
- CVE-2025-62567
- Published
- Dec 9, 2025
- Updated
- Apr 16, 2026
- Vendor
- Microsoft
- Product
- Windows Server 2019
- Classifications
- CWE-191, T1499
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Dec 9, 2025CVE publishedPublication date reported by the CVE source.
- Apr 16, 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=10.0.17763.0 <10.0.17763.8146
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.
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Technologies
Your stack
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Your stack
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