In iOS 7.0, a vulnerability has been discovered that allows anyone to bypass the Lock screen passcode. Swipe up from the bottom to access Control Center, then open the Clock app. Then hold the Sleep/Wake button until the option to power off the phone comes up. Tap Cancel, then quickly double-press the Home button, which brings up the multitasking screen, providing access to most open apps. Oops! To eliminate the problem for now, just disable Control Center on the Lock screen in Settings > Control Center. An Apple spokesperson said the company is working on a fix.