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Ruby-Nessus is a ruby interface for the popular Nessus vulnerability scanner. Ruby-Nessus aims to deliver an easy yet powerful interface for interacting and manipulating Nessus scan results and configurations. Ruby-Nessus currently supports both version 1.0 and 2.0 of the .nessus file format. Please remember to submit bugs and request features if needed.

More Information:


You can use the last version of the gem directly on Github:

gem 'ruby-nessus', git: ''

Or the version on (may be outdated) :

gem 'ruby-nessus'

Usage & Examples

The below example illustrates how easy it really is to iterate over result data.

  require 'rubygems'
  require 'ruby-nessus'"example_v1.nessus", :version => 1) do |scan|
  # OR:"example_v2.nessus") do |scan|   <-- Ruby-Nessus will figured out the correct Nessus file version.

    puts scan.title                     # The Nessus Report Title.
    puts scan.host_count                # Host Count.
    puts scan.unique_ports              # All Unique Ports Seen.

    scan.hosts.each do |host|
      next if    # Next Host If Event Count Is Zero.
      puts host.hostname                # The HostName For The Current Host.
      puts host.event_count             # The Event Count For The Current Host. do |event|
        next if event.severity.medium?  # Next Event Is The Event Severity Is Low. (supports high? medium? low?)
        puts if   # The Event Name If Not Blank.
        puts event.port                 # The Event Port. (supports .number, .protocol and .service)
        puts event.severity             # The Event Severity (0->Informational, 1->low, 2->medium, 3->high, 4->critical)
        puts event.plugin_id            # The Nessus Plugin ID.
        puts if   # Raw Nessus Plugin Output Data.

You also have the ability to search for particular hostnames. In the near future I plan to add the ability to pass the hosts block a hash of options for more complex searches.

  scan.find_by_hostname("") do |host|

    puts host.scan_start_time
    puts host.scan_stop_time
    puts host.scan_runtime

    host.high_severity_events do |event|
      puts event.severity
      puts event.port
      puts if


There are a bunch of convenient methods (maybe more then needed) added to make reporting a bit easier to produce quickly from a raw scan file. If you do not pass :version as an option it will default to the 2.0 .nessus schema."example_v2.nessus") do |scan|

    puts scan.event_percentage_for('low', true) #=> 8%

    puts scan.critical_severity_count       # Critical Severity Event Count
    puts scan.high_severity_count           # High Severity Event Count
    puts scan.medium_severity_count         # Medium Severity Event Count
    puts scan.low_severity_count            # Low Severity Event Count
    puts scan.open_ports_count              # Open Port Count

    puts scan.total_event_count #=> 3411    # Total Event Count
    puts scan.hosts.count #=> 12 do |host|
      puts host.hostname
      puts host.event_percentage_for('low', true)
      puts host.tcp_count #=> tcp, icmp, udp supported. do |event|
        next if event.informational?

        puts event.severity
        puts event.synopsis
        puts event.description
        puts event.solution
        puts event.output
        puts event.risk




Ruby-Nessus also ships with a POC CLI application for the lib called 'recess':

  Recess 0.1.1
  usage: recess FILE [OPTIONS]
      -f, --file FILE                  The .nessus file to parse.
      -h, --help                       This help summary page.
      -v, --version                    Recess Version.

Below is example output generated by recess:

  $> recess examples/example_v2.nessus 
  Recess - Ruby-Nessus CLI
  Version: 0.1.1

  -> SCAN Metadata: 

    Scan Title: Ruby-Nessus
    Policy Title: Ruby-Nessus

  -> SCAN Statistics: 

    Host Count: 2
    Open Port Count: 51
    TCP Count: 38
    UDP Count: 11
    ICMP Count: 1

  -> EVENT Statistics: 

    Informational Severity Count: 19
    Low Severity Count: 47
    Medium Severity Count: 3
    High Severity Count: 0
    Total Event Count: 50

    Low Event Percentage: 94
    Medium Event Percentage: 6
    High Event Percentage: 0

  -> HOSTS: 

        - IP Address::
        - Informational Count: 12
        - Low Count: 34
        - Medium Count: 1
        - High Count: 0

        - IP Address::
        - Informational Count: 7
        - Low Count: 13
        - Medium Count: 2
        - High Count: 0



  • Add The Ability to parse the scan configuration and plugin options.
  • Building XML (.nessus) files configurations
  • Add Support For NBE File Formats.

Note on Patches & Pull Requests

  • Fork the project.
  • Make your feature addition or bug fix.
  • Add tests for it. This is important so I don't break it in a future version unintentionally.
  • Commit, do not mess with rakefile, version, or history. (if you want to have your own version, that is fine but bump version in a commit by itself I can ignore when I pull)
  • Send me a pull request. Bonus points for topic branches.

Copyright (c) 2009 Dustin Willis Webber. See LICENSE for details.

Copyright (c) 2017 Florian Wininger. See LICENSE for details.