A security feature bypass vulnerability exists in Windows Hyper-V when access control list (ACL) configuration settings are not applied correctly. To exploit the vulnerability, an attacker could run a specially crafted application that could cause Hyper-V to allow unintended network traffic. Customers who have not enabled the Hyper-V role are not affected. The security update addresses the vulnerability by correcting how Hyper-V applies ACL configuration settings.

Further information on this exploit is available at : MS15-105