iOS7

[DaveB]

Which is what people are being advised to do, because the default configuration that Apple provide (which they will release a fix for) is one which gives people access to things that they aren't meant to have.

If it's not a hole, then why are Apple fixing it?

Apple haven't said they are releasing a fix for that, they are releasing a fix for the Lock Screen bypass issue. The ability of Siri to access specific functionality without having to unlock the screen was deliberate and is an option that can be turned off. Yes it should have been turned off by default, that was a poor configuration choice, but even if they change that the option will still be there to enable if it the user wants to.

[TheFaQQer]

"Another iOS 7 Bug Lets Anyone Make Calls From Locked iPhones--And This One Has No Quick Fix"

Linky