This vulnerability stems from improper input validation in Windows Hyper-V on Windows 10 Version 1607 (build 10.0.14393.0). It enables an attacker with local privileges and user interaction to execute arbitrary code, potentially leading to full compromise of the affected system. The CVSS v3.1 base score is 7.3, indicating high severity, with attack vector local, low attack complexity, low privileges required, and user interaction needed. Microsoft has published an official fix to remediate this vulnerability.

Successful exploitation allows an authorized local attacker to execute arbitrary code on the affected system, impacting confidentiality, integrity, and availability. This could lead to full system compromise if exploited.

An official fix is available from Microsoft. Users and administrators should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21247 to remediate this vulnerability.