Buffer overflow in InspIRCd before 1.1.18, when using the namesx and uhnames modules, allows remote attackers to cause a denial of service (daemon crash) via a large number of channel users with crafted nicknames, idents, and long hostnames.
https://exchange.xforce.ibmcloud.com/vulnerabilities/41543
http://www.vupen.com/english/advisories/2008/1041/references
http://www.securityfocus.com/bid/28506
http://www.openwall.com/lists/oss-security/2008/04/22/3
http://www.inspircd.org/forum/showthread.php?t=2945
http://www.inspircd.org/bugtrack/view_bug.php?bug_id=438
http://security.gentoo.org/glsa/glsa-200805-08.xml