Gadgets affected are unpatched devices running Android, Windows and Linux as well as earlier versions of iOS, according to security research firm Armis.
Researchers envisioned one worst-case scenario where a delivery person enters a bank with an infected smartphone that has Bluetooth enabled.
Armis said Google has issued a security update patch to address the Blueborne threat and notified its partners of it last month.
Armis said Microsoft issued security patches to all supported Windows versions on July 11, 2017 with co-ordinated notification on Tuesday.
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