Today Microsoft has released security updates exclusively for Microsoft Windows operating systems. Of the four bulletins released today, one has received the maximum severity rating of critical while the other three have received one of important. Maximum severity means that at least one Microsoft operating system has received the critical vulnerability rating.
In this case, the critical rating applies to all operating systems that Microsoft supplies with security patches. This includes the client operating systems Windows XP, Vista and Windows 7 as well as the server operating systems Windows Server 2008 and 2008 R2.
Here are two graphs visualizing the severity and exploitability index and the bulletin deployment priority.
Here is the list of security bulletins released in November 2011 by Microsoft.
Microsoft has published a video in which Jerry Bryant discusses this month's bulletins (Silverlight required).
The updates are already available on Windows Update. Users who have started their computer earlier today may need to run a manual update check in Windows Update.
The updates will also be available shortly at Microsoft's Download center.
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Ghacks is a technology news blog that was founded in 2005 by Martin Brinkmann. It has since then become one of the most popular tech news sites on the Internet with five authors and regular contributions from freelance writers.