OpenStack Neutron before 2014.2.4 (juno) and 2015.1.x before 2015.1.1 (kilo), when using the IPTables firewall driver, allows remote authenticated users to cause a denial of service (L2 agent crash) by adding an address pair that is rejected by the ipset tool.
Exploitability
AV:NAC:LAu:SImpact
C:NI:NA:P4/AV:N/AC:L/Au:S/C:N/I:N/A:P