As YubiRADIUS is no longer being maintained, you should check out GreenRADIUS – Yubico Edition
. GreenRADIUS is built from YubiRADIUS by the original developers, but is being carried forward by Green Rocket Security, a Yubico partner
. It is kept current with the latest updates, taking care of issues such as Heartbleed, Shellshock, and POODLE.
In addition, the server has been hardened specifically to remove unneeded services out of the box so you don’t need to. Services such as cups for printing, Samba for Windows file sharing, and NFS tools for accessing NFS shares are not included in the VM.
Check out the GreenRADIUS hardening page
to see how the server is hardened out of the box, and check out the latest security updates to the server here