Microsoft presents just one patch to fix a hole in its PowerPoint presentation program for May. Microsoft didn't provide many details about the release, except to say it carried a severity rating of "critical," the company's highest level. The company warned last month that it was aware of "limited and targeted attacks that attempt to use this vulnerability," which required prospective victims to download and open the booby-trapped PowerPoint documents.
Researchers at McAfee have said that they were seeing "multiple attacks in the wild using the PowerPoint exploit" to install Trojans onto vulnerable systems. So patch em if you got them...
MS09-017 :Vulnerabilities in Microsoft PowerPoint Could Allow Remote Code Execution
Severity - CRITICAL
http://www.microsoft.com/MS09-017.mspx