For the confusing concept of “smart” power outlets, which plug in on top of a normal outlet (while keeping both plugs open). Like most other “smart home” devices, they appear to almost always be Linux+ARM based.

The Wemo has been the subject of many exploits

Various methods for rooting this little “smart outlet” exist. The one described by exploiteers involves the UART in recovery mode, that requires some good timing. With it, one can execute commands as root with full filesystem access.

https://www.exploitee.rs/index.php/Belkin_Wemo