About 50 million android smart phones have Viber installed and a critical flaw in that app make all those devices vulnerable. It is as easy as sending two messages through Viber and attacker can gain full control to your device. It is scary how easy it is and I would expect a fix and ultra fast by the Viber app creators. You can watch the video to see exactly how it can be done and you can try it with a friend. It is the easiest and fastest exploit that I learned so far for android smart phones.
Flaw in Viber allows full access to smart phones