Who is affected?

The vulnerability affects all unpatched devices with Broadcom and Cypress FullMac Wi-Fi chips. These are the most common Wi-Fi chips used in today's client devices, made by well-known manufacturers including Amazon (Echo, Kindle), Apple (iPhone, iPad, MacBook), Google (Nexus), Samsung (Galaxy) as well as devices under many other brands.

Wi-Fi Access points and routers are also affected by Kr00k, making even environments with patched client devices vulnerable. All-in-all, before patching there were more than a billion affected devices.