Researchers discover a security loophole allowing attackers to use WiFi to see through walls which attackers can localize someone's devices and spoof beacons to pretend there's buffered traffic. The client's requested this traffic and revealed the MAC address. Fake frames are sent to the victims and the time-of-flight of the response is used for localization which can be done from cheap drones.
They have been using an ultra-light DJI mini 2 drone with two lightweight WiFi chips (an ESP8266 and ESP32). The idea is that you can now "look inside the room" and learn where devices are located.

Sources:
https://dl.acm.org/doi/abs/10.1145/3495243.3560530
https://www.engadget.com/wifi-security-hole-see-through-walls-152138038.html

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