Scientists at Germany's Karlsruhe Institute of Technology have exposed a critical surveillance vulnerability in modern Wi-Fi routers. Using only radio waves and no password access, researchers identified individuals passing through a space with 99.5% accuracy.

The vulnerability takes advantage of a feature called Beamforming Feedback Information (BFI), which shows up as a usual component in Wi Fi 5 and newer routers. 

In practice, routers lean on BFI to pull back feedback from the connected clients, basically to tune link speeds and........

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