I've been in lots of cod 5 lobbies and I've never gotten banned but last night I was in one and I got reset to rank 1 . There is a slim chance of getting deranked on cod 5 but if u get deranked and then get into another lobby and get caught I believe you get a 48 hr ban and if caught a third time you most likely will get a permanent ban just from cod5 not from xbox. Please rep hope this helped

Also just to tell you that this is a cod 4 discussion not cod5 XD