Notice that McAfee doesn't even apologize but instead berates the Gentoo hacker that discovered the flaw in the first place."This is very easy to exploit, and if VirusScan is used in a mail scanner on a mail server, just sending someone an e-mail with an attachment with the right name would execute it," Moc said.
I can't count the number of times I've fixed my wifes company laptop because of problems w/ McAfee's products.
My suggestion is to leave the closed source vendors alone. There are plenty of OSS alternatives out there.