mystring.c in hybserv in IRCD-Hybrid (aka Hybrid2 IRC Services) 1.9.2 through 1.9.4 allows remote attackers to cause a denial of service (daemon crash) via a β:help \tβ private message to the MemoServ service.
bugs.debian.org/cgi-bin/bugreport.cgi?bug=550389
marc.info/?l=oss-security&m=126476591925300&w=2
secunia.com/advisories/38350
secunia.com/advisories/38352
security.debian.org/pool/updates/main/h/hybserv/hybserv_1.9.2-4+lenny2.diff.gz
www.debian.org/security/2010/dsa-1982
www.securityfocus.com/bid/38006
exchange.xforce.ibmcloud.com/vulnerabilities/55992