As reported by 9to5Mac, the FaceTime bug can be activated when a caller adds his or her own phone number through the Add Person feature during FaceTime Video call. There's no way to limit FaceTime only to your friends, from what we know.
In the meantime, any iPhone that's ringing with an incoming FaceTime request is potentially listening in to its surroundings and sending the data back to the caller.
In brief You might want to disable FaceTime on your iPhone, iPad, or Mac until Apple patches this bonkers bug.
Ok, here's the thing. iOS 12.1 has a major bug with FaceTime. FaceTime then allows you to hear audio from the other person's device even if they have not accepted the call. For them, it looks like you're trying to FaceTime with them, but there's no indication that you can hear them (or, if you make noise, they can hear you).
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9to5Mac also found that if the person presses the Power button from the lock screen, their video is also sent to the caller, completely unbeknown to them.
The only option right now if you don't like the idea of anyone being able to eavesdrop on you?
Apple added multi-person FaceTime calling at the end of a year ago via a software update that was, in part, created to address previous software bugs.
In order to deactivate FaceTime on your iOS device, navigate to "Settings, ' then tap on 'FaceTime" and select 'Off'. At this point in time, disabling FaceTime or immediately dismissing FaceTime calls appear to be the only protection against snooping. You'll get better sleep either way.