I have been setting up a simple server, and was worried about some security risks. I found that the Pi is running openssh 6.7, when the most up to date version is 7.5. Tenable Nessus says this leads to multiple security vulnerabilities that can be resolved by downgrading openssh to version 7.5.
However, running apt-get update and apt-get upgrade returns no necessary updates. How would I guarantee security for my pi in this case?