Undocumented code could leave several smart home gadgets exposed
A billion devices use ESP32 chips

Smart home gadgets are designed to automate repetitive instructions to your appliances and take a little weight off your shoulders, but they achieve this through interactions with your home Wi-Fi and connection to appliances via Bluetooth and other protocols. However, the vast majority of smart devices could be vulnerable to participation in complex attacks on user privacy, simply because of a few undocumented commands found in one of the most popular microcontrollers on the market.