How are you detecting this vuln? Are you scanning the machines? You're right this was fixed in 12.1.2 so it shouldn't show up for those versions. Have you tried upgrading to the latest version, 12.1.4?
This vulnerability affected application and device control, do you use it?
Symantec Endpoint Protection Application/Device Control Policy Security Bypass Vulnerability
http://www.securelist.com/en/advisories/56345