The new vulnerability was discovered by Karam Daoud, a 27 year old from the West Bank city of Ramallah in Palestine, that allows anyone to make calls from a locked iPhone, including international calls and calls to premium numbers.
In a video, Daoud showed that calls can be made to any number from a locked iPhone running iOS 7 by using a vulnerability in the device’s emergency calling function.
The person needs to dial a number and then rapidly tap the call button until an empty screen with an Apple logo appears and makes the call to the particular number.
The Forbes writer tested the flaw on two iPhone 5 devices on separate networks and it worked both times. This is the second malfunction found in the lock screen since iOS 7 was seeded to all iPhone owners this past Wednesday.
Daoud notified Apple about the bug and received a same response that the next software update will fix this bug as well.