Nessus vs Bully: Which Cyber Security tool is Best in 2025?

Nessus is a leading vulnerability assessment tool developed by Tenable, Inc., widely recognized as the industry’s most trusted scanner for identifying security weaknesses across networks, devices, applications, and cloud environments. Launched in 1998 as an open-source project by Renaud Deraison, it transitioned to a proprietary model in 2005 and now offers two enterprise versions: Nessus Professional and Nessus Expert. With over 252,000 plugins and 100,000 plus CVEs, Nessus delivers high-accuracy scans to detect vulnerabilities, misconfigurations, and compliance issues. It supports unlimited IT assessments, customizable templates (450+), and vulnerability prioritization using CVSS v4, EPSS, and Tenable’s VPR. Nessus Expert extends capabilities to web application scanning, external attack surface monitoring, and cloud infrastructure audits.

Bully is a robust open-source wireless network auditing tool for ethical hacking, seamlessly integrated into Kali Linux (version 2024.06.R1). As a Wi-Fi Protected Setup brute-force tool for cybersecurity, it targets WPS vulnerabilities to recover WPA/WPA2 passphrases, making it a top wireless password recovery tool for penetration testing. Written in C with a 1.4 MB size, Bully offers improved performance over Reaver, supporting Pixie-Dust attacks for rapid PIN cracking.