The SASL negotiation in Jabber Studio jabberd before 2.0s11 allows remote attackers to cause a denial of service ("c2s segfault") by sending a "response stanza before an auth stanza".
https://exchange.xforce.ibmcloud.com/vulnerabilities/25334
http://www.vupen.com/english/advisories/2006/1009
http://www.securityfocus.com/bid/17155
http://www.redhat.com/support/errata/RHSA-2008-0261.html
http://support.apple.com/kb/HT4077
http://secunia.com/advisories/19281
http://lists.apple.com/archives/security-announce/2010//Mar/msg00001.html