Perhaps you've been hearing strange sounds in your home—ghostly creaks and moans, random Rick Astley tunes, Alexa commands issued in someone else's voice. If so, you haven't necessarily lost your mind. Instead, if you own one of a few models of internet-connected speaker and you've been careless with your network settings, you might be one of thousands of people whose Sonos or Bose devices have been left wide open to audio hijacking by hackers around the world.

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