Update 3/12: Some Windows 7 users are reporting that the update left their computers stuck in a reboot loop. The culprit was found out to be a file called MS Update 3033929, which helps the computer figure out whether a file is authentic or not.
If you have this update installed on your Windows 7 PC, then you'll want to avoid restarting your computer until Microsoft can release a fix. If you don't, then be sure to install all of the Patch Tuesday updates except for MS Update 3033929.
Most important is a fix for the FREAK bug, which Apple patched on Monday. The FREAK bug, if you didn't catch my coverage so far, lets hackers remotely execute code on vulnerable computers. Find out more about the bug here.
Also patched was the vulnerability that security experts suspect was exploited by cyberespionage agents to delay Iran's nuclear ambitions. The HP Tipping Point blog explains:
Stuxnet was extremely notorious given the fact that it was highly complex and specifically targeted certain Siemens SCADA systems. Significant research organizations concluded that the level of investment required to develop Stuxnet must only have been possible with the backing of one or more nation-states.
Given the implications for large-scale cyber warfare and the length it remained undetected in the systems it targeted only made the worm more deadly.