The issue stems from what researchers are calling an SSL certificate parsing vulnerability in iOS 8.0. After developing a script to exploit the bug over a network interface, researchers found they could repeatedly crash apps. Apple is apparently aware of the issue and is in the process of fixing it. The bug could theoretically affect any iOS app that uses SSL certificates, or most apps that use that type of certificate. It’s unclear when this issue will get fixed by Apple, but it did address a bevy of issues in iOS two weeks ago.
Source: https://threatpost.com/ios-vulnerability-could-force-devices-into-endless-reboot-loop/112406/