Ulrich
iPF Novice
An iOS update to fix the zombie passcode security bug and Exchange issues is expected to arrive around February 20, according to new claims from German-language Apple site iFun. The site, which previously played Nostradamus for the impending release of iOS 6.1.1 for iPhone 4S, says iOS 6.1.2 is already in the works and will be seeded to users within the next week.
Source: Exchange, passcode bugs reportedly squashed in upcoming iOS 6.1.2 | Ars Technica
You may want to update to iOS 6.1 (and jailbreak) if you have not already...