OpenStack Neutron before 2013.2.4, 2014.x before 2014.1.2, and Juno before Juno-2 allows remote authenticated users to cause a denial of service (crash or long firewall rule updates) by creating a large number of allowed address pairs.
https://bugs.launchpad.net/neutron/+bug/1336207
http://www.securityfocus.com/bid/68765
http://secunia.com/advisories/60804
http://secunia.com/advisories/60766
http://seclists.org/oss-sec/2014/q3/200
http://rhn.redhat.com/errata/RHSA-2014-1120.html
http://rhn.redhat.com/errata/RHSA-2014-1119.html
http://lists.openstack.org/pipermail/openstack-announce/2014-July/000255.html