iOS 6.1.3 has only just been released by Apple, and already a security hole has been followed. The flaw was found by videosdebarraquito who seems to be making a hobby of embarrassing Apple by uncovering lock bypass flaws. The good news is that this security flaw can be easily prevented by disabling Voice Dials feature on iPhones using Siri voice recognition feature. Apple promised to fix other security flaws that allowed the lock screen to be bypassed.”]
Source: https://nakedsecurity.sophos.com/2013/03/21/ios-6-1-3-passcode-lock-bypass/