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.
The purpose of this utility is to generate license files for customers in secured environments. Upon authentication, you will need to enter a set of required data in order to generate a license file. Please read the "How to use the License Utility" and run the appropriate product utility to gather the data prior to requesting a license. After entering your e-mail address and the serial key for the system being licensed, you will need to agree to the F5 End User License Agreement in order to proceed.