That's likely because it wasn't tested by Veritas. According to the group that made the find:
iDEFENSE has confirmed the existence of this vulnerability in Backup Exec for Windows Servers versions 9.1 and 10.0. It is suspected that earlier versions are also vulnerable.
8.x versions are fairly well out of date, so I don't blame them (Ver) for not testing it, but it still would be nice to know for sure. Either way, its better to know you're covered than to find out the hard way that just because they didn't explicitly say your version, didn't mean it wasn't going to hit you.