NSE script based on Vulners.com API. NSE script using some well-known service to provide info on vulnerabilities.
The only thing you should always keep in mind is that the script depends on having software versions at hand, so it only works with -sV flag.
locate, where your nmap scripts are located in your system
for *nix system it might be ~/.nmap/scripts/ or $NMAPDIR
for Mac it might be /usr/local/Cellar/nmap/<version>/share/nmap/scripts/
for Windows you have to find it yourself
copy the provided script (vulners.nse) into that directory
It is KISS after all.
Use it as straightforward as you can:
nmap -sV --script vulners <target>