That block was mined late June, did this exploit have something to do with wallet problems during summer? I mean there were speculations about bad nodes and stuff like that?
I cannot really remember what was happening at that time but I don't think there was any active development on Cryptonite in that period and the block explorer was down, which is probably why it went unnoticed. I doubt the exploit had anything to do with wallet problems, the wallet has always been fairly buggy until recently, but many of those stability issues have been solved over the last few months.
My mistake, didn't look dates closely enough, I thought it was June 2017. Now that all starts to make sense.
Someone made a shitton of money out of this, looks like xcn was just a small part of a bigger game, game that is getting closer to first overtime.