In the meantime, Cisco has updated the instructions several times – and also equipped other firmware versions of ASA and FTD appliances with protection functions that can be activated.

service of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS ...

To enable these new features, you must be running a supported version of Cisco ASA and FTD, which are listed below: ASA Software: 9.16 version train -> supported from 9.16(4)67 and newer versions ...