Cybersecurity Lab

Nessus Vulnerability Assessment

A vulnerability assessment workflow using Nessus and Nmap to identify, prioritize, and document weaknesses in a Metasploitable2 lab target.

Completed2026Beginner

Objective

Practice turning scanner output into a readable vulnerability assessment with risk, evidence, and remediation language.

Tools Used

Nessus EssentialsKali LinuxMetasploitable2

Steps Performed

  • Configured a Basic Network Scan in Nessus Essentials for the Metasploitable2 target at 192.168.128.2.
  • Ran Nmap service detection against the same target to document exposed services.
  • Reviewed Nessus host and vulnerability summaries after scan completion.
  • Separated informational output from actionable critical, high, medium, and low findings.
  • Wrote a CVE summary for CVE-2014-3566 POODLE based on scan evidence.

Key Findings

  • Nmap identified 23 open TCP services, including FTP, SSH, Telnet, SMTP, DNS, HTTP, SMB, NFS, MySQL, PostgreSQL, VNC, IRC, Tomcat, and a bind shell on port 1524.
  • Nessus reported a completed scan with multiple critical, high, medium, low, and informational findings.
  • The host summary showed a single target with failed authentication and many informational findings.
  • CVE-2014-3566 POODLE was documented as a critical SSL 3.0 weakness with remediation guidance to disable SSL 2.0 and SSL 3.0 and use TLS 1.2 or higher.

Screenshots

Nessus Essentials scan template screen showing Basic Network Scan and other scan options.
Nessus scan template selection
Nessus scan configuration for Metasploitable2 target 192.168.128.2.
Nessus scan settings
Nessus host summary while the Metasploitable2 vulnerability scan is running.
Running host summary
Nessus completed host summary for the Metasploitable2 vulnerability scan.
Completed host summary
Nessus vulnerabilities overview showing scan details and vulnerability severity distribution.
Vulnerability overview
Nessus vulnerability list with critical, high, medium, low, mixed, and informational results.
Vulnerability list

Evidence Files

Lessons Learned

  • Scanner findings are a starting point for analysis and need validation against service evidence.
  • Combining Nmap output with Nessus findings makes the final report easier to explain.
  • Clear remediation guidance is as important as identifying the issue.

Future Improvements

  • Create before-and-after remediation tracking.
  • Add screenshots directly into the written lab report.
  • Export findings into a reusable report format.

References

  • Tenable Nessus documentation
  • Nmap Reference Guide
  • CVSS documentation