Alexa and Siri are vulnerable to 'silent,' nefarious commands in Endgadget by S. Dent Unheard voices could direct your smartphone to malicious websites. ....
Google home as well. Commands above 20K hz, ultrasonic frequencies un-hearable by humans, are still interpreted by these devices with what is called a Dolphin Attack.
Positives are that the signal has to be within a few feet, thus you have to have access to the device itself, or be in a public space. And, it would be easy to filter out these frequencies.
(Update) More in FastCodesign.
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