Microsoft has made available the security patches for March 2012. The patches are already being distributed via Windows Update, but at the time of writing not at Microsoft's Download Center. A total of six security bulletins have been released, of which one has received the highest severity rating of critical. Four of the remaining updates received a severity rating of important, and one a moderate rating.
The bulletins address vulnerabilities and issues in Microsoft Windows operating systems, Visual Studio and Expression Design. Microsoft recommends that company and end-users focus on deploying the patches for the critical vulnerability first, before they move on to the important and moderate issues.
Take a look at the Bulletin Deployment Priority chart, and the Severity and Explotability Index below (via the MSRC blog)
Here are the executive summaries for the bulletins, and links that point to each bulletin's page on the Microsoft website.
You may need to run a manual update check in Windows Updates for the system to detect the updates right away.
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