WebKit in Apple iOS before 9.3.5 allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted web site.
https://www.youtube.com/watch?v=xkdPjbaLngE
https://www.exploit-db.com/exploits/44836/
https://support.apple.com/HT207107
https://blog.lookout.com/blog/2016/08/25/trident-pegasus/
http://www.securitytracker.com/id/1036694
http://www.securityfocus.com/bid/92653
http://lists.apple.com/archives/security-announce/2016/Aug/msg00000.html