ejabberd_c2s.erl in ejabberd before 2.1.3 allows remote attackers to cause a denial of service (daemon crash) via a large number of c2s (aka client2server) messages that trigger a queue overload.
secunia.com/advisories/38337
secunia.com/advisories/39423
www.debian.org/security/2010/dsa-2033
www.openwall.com/lists/oss-security/2010/01/29/1
www.openwall.com/lists/oss-security/2010/01/29/5
www.osvdb.org/62066
www.securityfocus.com/bid/38003
www.vupen.com/english/advisories/2010/0894
exchange.xforce.ibmcloud.com/vulnerabilities/56025
support.process-one.net/browse/EJAB-1173