Pretty much what the topic says. CC doesn't work on these guys at all.
Is that intended? I can see maybe on Hard mode but on normal it really becomes trial and error and a lot of luck to get past this encounter. Ran it twice and both runs had multiple wipes on this boss.
Umm, bosses that can't be cc'ed are common in WoW and LotRO both, I've seen it. Most elite enemies are immune to cc in the world as well in TOR. None of my CC's worked for my JK Guardian against Silvers or above.
So I'd say that it was intentional. No fun if there's no challenge.