Furthermore, today's Patch Tuesday updates were supposed to include 14 bulletins, according to the Advance Notification issued last week. Only 13 were issued today. I asked Microsoft about the missing update. Microsoft’s Dustin Childs, Group Manager, Microsoft Trustworthy Computing, gave this statement:
We are committed to delivering high-quality security updates for our customers and extensively test each bulletin prior to release. During some additional testing after advance notification, we determined one of the updates was not quite ready. We have not detected any attacks against this issue, or any of the others addressed today, and we'll continue to work on the bulletin and release it once it is ready, through our regular bulletin release process.