I was initially under the impression that only 10.1 was vulnerable to the new exploit that went out, but apparently it’s almost every 10. version of the software. The web page at symantec’s sym06-010 page is good for providing links on what needs to be upgraded to what version. This is something that symantec is VERY poor at doing – I’ve never received a new patch level notification or anything, apart from the marketing push to upgrade to the latest version – but even then the latest versions that I’ve been sent haven’t been the latest version and have needed patching!