The virtual router in Apache CloudStack before 4.2.1 does not preserve the source restrictions in firewall rules after being restarted, which allows remote attackers to bypass intended restrictions via a request.
https://issues.apache.org/jira/browse/CLOUDSTACK-5263
https://blogs.apache.org/cloudstack/entry/cve_2013_6398_cloudstack_virtual
http://www.securitytracker.com/id/1030762
http://www.securityfocus.com/bid/69432
http://support.citrix.com/article/CTX140989