Users with too much time on their hands recently discovered a bug in the PlayStation 4 that could be exploited to crash the console. It was easy as sending a specific and malicious message to the unsuspecting PS4 user. After receiving widespread attention, Sony has gone and fixed the bug so all is apparently good in the world of PS4 gaming

Source: Hot Hardware – Sony Fixes Super Annoying PlayStation 4 Messaging Bug That Crashed Consoles