The default_encrypt function in encrypt.c in IRC Services before 5.0.63, and 5.1.x before 5.1.7, allows remote attackers to cause a denial of service (daemon crash) via a long password. NOTE: some of these details are obtained from third party information.
https://exchange.xforce.ibmcloud.com/vulnerabilities/38591
http://www.vupen.com/english/advisories/2007/3959
http://www.securityfocus.com/bid/26517
http://www.ircservices.za.net/Changes.txt
http://security.gentoo.org/glsa/glsa-200712-12.xml
http://secunia.com/advisories/28090
http://secunia.com/advisories/27761
http://lists.ircservices.za.net/pipermail/ircservices/2007/005564.html
http://lists.ircservices.za.net/pipermail/ircservices/2007/005558.html