Voice Assistants Have a Variety of Underlooked Vulnerabilities: Ultrasonic Commands, Cloned Voices, and Even Lasers - CPO Magazine

New type of attack on voice assistants uses ultrasonic waves to access the devices through solid surfaces that are inaudible to humans without the use of special equipment.
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Hackers Can Use Ultrasonic Waves to Secretly Control Voice

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Hackers Can Silently Control Siri, Alexa & Other Voice Assistants

nlp/bayes/description.txt.bak at master · GBWen/nlp · GitHub

Hackers Can Silently Control Siri, Alexa & Other Voice Assistants

Popular voice assistants like Siri or Alexa easily hacked with