Top Scanning Tools Used by Cybercriminals to Exploit Network Vulnerabilities

Cybercriminals today are faster, smarter, and more automated than ever before. They’re using the same tools as legitimate security professionals but with a very different goal: to find and exploit your network’s vulnerabilities before you even know they’re there.

• SIPVicious – Used in nearly 50% of detected scan events, this toolset originally meant for SIP-based VoIP audits is now a favorite among attackers looking to exploit vulnerable VoIP servers.
• Qualys – A respected tool in cybersecurity circles, now appearing in 2.5% of malicious scans. It’s a clear example of how legitimate software can be turned against us.
• Nmap – This open-source classic still plays a vital role in network reconnaissance. Attackers use it to map networks and identify open ports fast.
• Nessus & OpenVAS – Enterprise-grade scanners that help uncover complex vulnerabilities. While used by defenders, they’re also powerful in the wrong hands.

Cybercriminals are automating reconnaissance. Are you automating your defense?

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Source: 2025 Fortinet Global Threat Landscape Report