I am new in nmap. I wanna know is there a command for detecting high, medium or low vulnerabilities on hosts, lists number of their vulnerabilities and shows them?


nmap itself is not really a vulnerability scanner though it handles functions related to vulnerability detection and remediation. nmap does support something called NSE (NMAP Scripting Engine) for which many people have written scripts that perform automated checks for certain vulnerabilities using nmap. You could conceivably match the vulnerabilities found with a priority list, that you yourself maintain, that maps a vulnerability to a given severity level.

You are probably much better off using a framework like Metasploit for this.

Here is a nice resource, though, that explains some of the different components that might help you get to your stated goal: http://resources.infosecinstitute.com/nmap-cheat-sheet/

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