After seeding as many as seven betas of OS X 10.9.2 to developers, Apple has finally released the OS X Mavericks 10.9.2 update to the public, bringing with it a few bug fixes and enhancements, along with a much needed security fix.
That security fix is quite important as it fixes an SSL security bug, which allowed an attacker to bypass SSL/TLS verification.
Aside from that, the update also allows OS X users to make and receive FaceTIme audio calls, as well as adding call waiting support.
Finally it also adds the ability to block iMessages from individual senders, and included improved VoiceOver navigation in mail, Autofill improvements, VPN and audio fixes, and a ton of general enhancements and improvements.
Apple also released security updates for Mountain Lion and Lion.