Apple has released a bugfix secutiy update for iOS 7, noting that a NULL dereference existed in the lock screen which would cause it to restart if the emergency call button was tapped repeatedly. The list of apps you opened could be accessed during some transitions while the device was locked, and the Camera app could be opened while the device was locked. While the lock screen was restarting, the call dialer could not get the lock screen state and assumed the device was unlocked, and so allowed non-emergency numbers to be dialed. Ergo: a person with physical access to the device may be able to make calls to any number. This issue was addressed by avoiding the NULL dereference.
Update available for: iPhone 4 and later, iPod touch (5th generation) and later, iPad 2 and later
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