source: http://www.securityfocus.com/bid/7189/info

A denial of service vulnerability has been reported for Emule. The vulnerability occurs when a Emule client recieves a chat request without a nickname. 

This vulnerability was reported for Emule clients prior to 0.27c.

https://github.com/offensive-security/exploit-database-bin-sploits/raw/master/bin-sploits/22420.zip