In this chapter, we first look at the fundamentals of attacks in the cyberspace by introducing common attack models used to formalise cyberattacks. After that, we tailor techniques we learned to the environment of voice-controllable devices, and we build the HAVOC Kill Chain, which describes the typical attack structure against the voice channel of a VCD. After that, we introduce the HAVOC Threat Model, with which we formalise the adversary’s capabilities and knowledge in a typical attack against the voice channel. Together, these two form the HAVOC (Hostile Activities on the VOice Channel) Model, that can be used to describe preconditions and unfolding of any attack against the voice channel.