Yesterday's Patch Tuesday brought 13 security bulletins fixing a total of 19 different vulnerabilities affecting Microsoft products.
The majority of security patches have been released for Microsoft's Windows operating system and Microsoft Office, with a cumulative security update released for Internet Explorer as well.
The updates are already available on Windows Update and via the Microsoft Download Center for users who prefer to download them separately. A DVD Iso image has also been released with December's security updates.
Microsoft recommends to focus the attention on the MS11-092 – Windows Media and MS11-087 – Windows critical updates before installing the remaining patches.
The bulletin deployment priority table, and severity and exploitability index provide further assistance.
Here is a list of all bulletins released in December 2011 by Microsoft.
The next upcoming scheduled security update will be on the 10th of January 2012.
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