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In January, several vulnerabilities were addressed, including CVE-2025-21334, CVE-2025-21333, and CVE-2025-21335. These issues, while not directly affecting Hyper-V servers, posed significant vulnerabilities leading to potential elevation-of-privilege scenarios in the NT kernel integration virtual service provider (VSP) layer.
Critical logging and access control procedures need to be followed
The existence of this vulnerability permits attackers to execute arbitrary code as if they were the Hyper-V host itself, potentially granting them near-total access to the server’s hardware. The implications of such access are considerable; once a malicious actor compromises the Hyper-V host, they can alter the resource distribution to guest operating systems, extract sensitive data from those systems, and may even compromise or obliterate entire guest environments.
To mitigate risks associated with accessing sensitive data at this level, it is crucial to utilize isolated configurations and appropriate services and tools. Implementing rigorous logging and adhering to zero-trust principles are essential steps in this process. Additionally, organizations should secure the necessary licensing to support effective logging practices. Keeping a separate external storage for logging data is recommended to ensure that access records are preserved, as cloud logging mechanisms often fail due to inadequate preliminary capture protocols.
Source
www.csoonline.com