What can hackers do with this?
Remotely play media on your device, rename your device, factory reset or reboot the device, force it to forget all wifi networks, force it to pair to a new bluetooth speaker/wifi point, and so on.
What CAN'T hackers do with this?
Assuming the Chromecast/Google Home is the only problem you have, hackers CANNOT access other devices on the network or sniff information besides WIFI points and Bluetooth devices. They also don't have access to your personal Google account, nor the Google Home's microphone. They do have access to the noise level in the room though
What information is being leaked?
What WIFI your Chromecast/Google Home is connected to, what bluetooth devices it has paired to, how long it's been on, what WiFi networks your device remembers, what alarms you have set, and much more.
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