Actively exploited in the wild
Microsoft Windows Hyper-V NT Kernel Integration VSP Heap-based Buffer Overflow Vulnerability
Microsoft - Windows · Listed in the CISA KEV since 2025-01-14. This indicates confirmed attacks in production environments.
Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
CVE-2025-21333
HighCVSS 7.8KEVSummary
A vulnerability in Windows Hyper-V NT Kernel Integration VSP allows for elevation of privilege. Technical details are not provided in the description.
Risk Assessment
An attacker with local access could exploit this vulnerability to gain higher privileges in the system, potentially leading to control over the virtual machine or host.
Recommendation
Apply the latest Windows security updates provided by Microsoft that address this vulnerability.
Other vulnerabilities in Windows Hyper-V
See all- CVE-2017-8714High
The Hyper-V component on Microsoft Windows 8.1, Windows Server 2012 Gold and R2, Windows 10 1607, and Windows Server 2016 has a vulnerability allowing remote code execution when it fails to properly validate input from an authenticated user on a guest operating system.
- CVE-2017-8664High
A vulnerability in Windows Hyper-V allows remote code execution when the system fails to properly validate input from a privileged user on a guest operating system.
- CVE-2017-0193High
A vulnerability in Windows Hyper-V allows an attacker to gain elevated privileges on a target guest operating system when Hyper-V instruction emulation fails to properly enforce privilege levels.
- CVE-2017-0212High
Windows Hyper-V contains a vulnerability that allows for elevation of privilege when Microsoft Windows 10 Gold, 1511, 1607, 1703, and Windows Server 2016 fail to properly validate vSMB packet data.
- CVE-2026-69910Critical
Stack-based buffer overflow in Windows Hyper-V allows an unauthorized attacker to execute code remotely over a network.
- CVE-2026-40402Critical
A use after free vulnerability in Windows Hyper-V allows an unauthorized attacker to elevate privileges locally.
- CVE-2025-21335HighActively exploited
A vulnerability in Windows Hyper-V NT Kernel Integration VSP allows for elevation of privilege. Technical details are not provided in the description.
- CVE-2025-21334HighActively exploited
A vulnerability in Windows Hyper-V NT Kernel Integration VSP allows for elevation of privilege. Technical details are not provided in the description.
- CVE-2024-38080HighActively exploited
A vulnerability in Windows Hyper-V allows for elevation of privilege. The NVD description does not provide technical details or required user interaction.
- CVE-2021-26867Critical
Remote code execution vulnerability in Windows Hyper-V. An attacker could exploit this flaw to execute arbitrary code on the host.
Original NVD description (English source)
Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability