Unspecified vulnerability in Xchat 2.6.7 and earlier allows remote attackers to cause a denial of service (crash) via unspecified vectors involving the PRIVMSG command. NOTE: the vendor has disputed this vulnerability, stating that it does not affect 2.6.7 "or any recent version"
https://www.exploit-db.com/exploits/2147
https://www.exploit-db.com/exploits/2124
https://exchange.xforce.ibmcloud.com/vulnerabilities/28325
http://www.securityfocus.com/bid/19398
http://securitytracker.com/id?1016687