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Keeping this in consideration, what does Qualys do?
Vulnerability Management (Qualys) Qualys is a commercial vulnerability and web application scanner. It can be used to proactively locate, identify, and assess vulnerabilities so that they can be prioritized and corrected before they are targeted and exploited by attackers.
Also asked, how does a Qualys scan work?
Qualys uses a unique inference-based scan engine to find vulnerabilities. Each scan begins with a pre-scan module which accurately fingerprints a host. The fingerprinting is performed by sending a series of specially crafted packets to the host and by interpreting the results.
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