Apple have just released software updates to fix a rather serious security problem where a valid SSL response wasn't checked properly to ensure it matches the site actually being browsed. I have an iPhone 5, but unfortunately I have a strong personal aversion to the iOS 7 look and feel, so this far I've kept it on iOS 6.1.3.
Other users have better reasons than I to stay on iOS 6. For example, some people might be reliant on an app that has no iOS 7 version (as per bmike's comment), or the device might not have enough memory for the upgrade (as in this duplicate post).
Apple have released iOS 6.1.6 ("Available for: iPhone 3GS, iPod touch (4th generation)"), but my iPhone 5 gives me no option to upgrade to any iOS other than 7.0.6. Similarly, iPhone 4 and iPhone 4S, iPad 2, [new] iPad (3rd gen), iPad Mini and iPod Touch (5th Gen) all ran lower versions of iOS 6 but do not have builds of iOS 6.1.6 to install.
My iPhone is not currently jailbroken, but I would consider doing so in order to avoid having to use the iOS 7 interface. I'd rather not have to choose between the iOS version I prefer and this security patch for SSL. What options are feasible?