It is strange that links to the demonstration of a working exploit for popular versions of iOS are still not available on Habré :)
November 7th
Stefan Esser tweets
With a link to a specially crafted video, resulting in a reboot of the device. No technical details yet.
Video:
rg0rd.com/better/1.mov')
Waiting for jailbreak under iOS 7.0.3?
Exploit tested on IPhone 4S (6.1 / 7.0.3), IPhone 5 (7.0.3)