A possible attack scenario would be to shoot down mining pools so that others are favourized. Also netsplits are being a lot easier now, this is a serious bug in my humble opinion.
Mining pools hide their private mining nodes from the network, so it's not quite so simple.
I am just thinking on how to disclose it, because I would like to have my time honored in some manner.
If someone would promise me, to honor my time in a proper way in case the bug really works, I would disclose it (to you privately if preferred) immediately.
I would be also willing to donate all my bitcoins to the bitcoin foundation in case my DOS is not working ;-)
I have a proof of concept script, that will shoot down your local (or any other node that you can reach by its ip) in a manner of microseconds. Ready when you are.
If it's really as simple as send a few messages and crash a node and effects 0.10 then I agree it needs to be fixed right away... You'd be credited in the commit for the fix (and likely a CVE, if its an outright crash), like anyone else who has reported a similar issue. This is the reasonable and customary way things are handled in open source projects, and the only reasonably scalable one (even if you put in 'a lot' of time, it pales in comparison to the thousands of hours put in by others; besides who do you think can afford that? non-technical people don't give a crap about this stuff... they think the software is magic). I'd also remove the negative trust I have against you here on the forum, since you made good; and not harass you in the future about initial asking for a huge out-of-the-norm bounty in this case. Thats all I can offer. Otherwise, if something exists here that is unknown, it'll have to wait until someone else rediscovers it.