It appears that Apple has plugged the hole that allowed jailbreak developers to achieve an iOS 7 untethered jailbreak.
Last month the first ever iOS 7 untethered jailbreak was released. Compatible with all latest Apple mobile devices, this jailbreak was widely adopted within a few days by members of the community who had been waiting for a long, long time. The evad3rs developer team is behind the jailbreak, commonly known as the evasi0n iOS 7 untethered jailbreak. The exploit used in this jailbreak might have already been patched by Apple, claims popular developer iH8sn0w.
He tweeted that Apple has patched the kernel exploit, while the code sign bug used by the jailbreak remains untouched. Yesterday Apple seeded iOS 7.1 beta 4 to developers. The latest update of the upcoming major iOS 7 update brought a few user interface tweaks, majority of the changes were made under the hood though. One such changes appear to be the patching of the quintessential exploit, which if left untouched, would probably have been used to achieve an iOS 7.1 untethered jailbreak.
It remains to be seen if the developer team has any exploits up its sleeve that it hasn’t made public yet and that Apple is unaware of. If the team has to find a new exploit all over again, then it might take a few months for an iOS 7.1 untethered jailbreak to become available.