iOS's SSL bug: when was it introduced?

Since, despite repeated pleas, I absolutely failed to get an answer in the Pit thread, I ask here.

So there’s a major bug with SSL implementation in iOS 7 that requires an update. But I myself am still on iOS 6 on my iPad. Am I or am I not vulnerable to this bug? Every article I’ve read so far in Google about this all assume that you’ve already updated to iOS7.

Thanks in advance.

It’s present in iOS 6: