On BIG-IP 15.0.0-15.1.0.1 14.1.0-14.1.2.3 13.1.0-13.1.3.3 12.1.0-12.1.5.1 and 11.6.1-11.6.5.1 malformed input to the DATAGRAM::tcp iRules command within a FLOW_INIT event may lead to a denial of service.