It appears, the Sony PS3 has been the longest hack hold-out, in my recollection. That took ~2 yrs. before being broken.
I’m sure, with the NSA back-door, the iPhone was child’s play compared /s
There is no back door. . . even this requires cooperation of the user, either deliberately or through social engineering. At best it will be a Trojan. . . and the vulnerability in both Chrome and Safari will be closed quickly.