Google released a hacking tool for iOS 11.1.2 (11.2 is out now) that is says can find bugs in that release. Supposedly in can only be used on the 7, 6s, and iPod touch 6G, but can be adapted for use on others. According to Google this tool is out there to help Apple patch exploits faster and make iOS more secure. I guess we'll just have to take Google at their word on this one.