Qualys

Qualys is one of the oldest and most widely deployed cloud-based vulnerability management platforms, having pioneered the SaaS delivery model for security scanning in 2000. Today it operates as the Enterprise TruRisk Platform — a unified, multi-application security suite delivered entirely from the cloud. The platform uses a lightweight Cloud Agent that continuously streams telemetry from endpoints, servers, VMs, cloud workloads, and containers back to Qualys’ multi-tenant cloud for processing. Where agents cannot be deployed, agentless virtual scanner appliances handle internal network and credentialed scanning, providing continuous visibility rather than point-in-time snapshots.

The core differentiator is the TruRisk scoring engine, which replaces naive CVSS-only prioritisation with a composite risk score incorporating exploit maturity, EPSS probability scores, CISA KEV membership, asset criticality, network exposure, and malware associations. This means security teams can focus remediation on the roughly 3-5% of vulnerabilities that represent genuine exploit risk rather than working through thousands of theoretical findings. The platform also integrates MITRE ATT&CK mapping so vulnerabilities can be prioritised by the tactic or technique they enable.

Qualys’ breadth is notable: VMDR, Web Application Scanning, Container Security, Cloud Security Posture Management, Patch Management, EDR, and Policy Compliance all run on the same agent and feed the same data lake. With FedRAMP High Authorization and over 10,000 enterprise customers — including the majority of the Forbes Global 500 — it is one of the most widely used commercial vulnerability management platforms in the world.