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CVE-2015-3221 is an improper input validation vulnerability in OpenStack Neutron affecting versions before 2014.2.4 (juno) and 2015.1.x before 2015.1.1 (kilo). When Neutron is configured to use the IPTables firewall driver, a remote authenticated user can add an allowed-address pair containing input that is rejected by the underlying ipset tool. Neutron does not properly validate or safely handle this invalid address-pair input before passing it into the firewall/ipset handling path, which can cause the Neutron L2 agent to crash.
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