Per F5 recommendations:
F5 Security Incident and Quarterly Security Notification
F5 customers are strongly recommended to ensure their TMOS is running at least 17.5.1.3 / 17.1.3 / 16.1.6.1 / 15.1.10.8. BIG-IQ 8.4 or F5 OS 1.5.4 or 1.6.4 or higher version to ensure the security of their F5 infra structure.
Please ensure you are running a compliant version per the articles above.
You can run F5® hardware and software products in secure environments where there is no Internet connectivity and data cannot leave the secure environment.
For CCN customers, F5 offers a manual licensing process. The product exports a system-specific set of data that is submitted manually. The F5 license server will return a system-specific license file. The product will then use the license file to enable software features and disallow the license from being installed on additional systems.
To be eligible for software version upgrades, a system must have a current F5 service contract. This eligibility is automatically validated through the service check date in the license file and the software release date embedded in the software.
For more information, please see K7727: License activation may be required before a software upgrade for the BIG-IP or Enterprise Manager system.