Recent VMware security bug (VMSA-2017-0006) is related to one of the worst possible security issue in a virtualization environment: a possible “guest escape” vulnerability that allows arbitrary code execution on a host system from the guest system. It’s not the first time of a similar risk (see, for example, Microsoft Edge used to escape VMware Workstation at Pwn2Own 2017) but this kind of issue is a different risk level if it affect Worksation (so “just” a client environment) or a ESXi (potentially a datacenter environment).