manager.c in Asterisk Open Source 1.6.1.x before 1.6.1.24, 1.6.2.x before 1.6.2.17.2, and 1.8.x before 1.8.3.2 allows remote attackers to cause a denial of service (CPU and memory consumption) via a series of manager sessions involving invalid data.
https://exchange.xforce.ibmcloud.com/vulnerabilities/66139
https://bugzilla.redhat.com/show_bug.cgi?id=688675
http://www.vupen.com/english/advisories/2011/0790
http://www.vupen.com/english/advisories/2011/0686
http://www.securityfocus.com/bid/46897
http://www.debian.org/security/2011/dsa-2225
http://securitytracker.com/id?1025223
http://openwall.com/lists/oss-security/2011/03/21/12
http://openwall.com/lists/oss-security/2011/03/17/5
http://lists.fedoraproject.org/pipermail/package-announce/2011-March/057163.html
http://lists.fedoraproject.org/pipermail/package-announce/2011-March/057156.html
http://lists.fedoraproject.org/pipermail/package-announce/2011-March/056945.html
http://downloads.asterisk.org/pub/security/AST-2011-003.html