Picus Security Explains How Vulnerability Scanners Work

Cybersecurity firm Picus Security has released a comprehensive overview of how vulnerability scanners function and their significance in modern IT environments. The guide explains how these automated tools identify and classify known weaknesses in IT systems, including servers, networks, and applications.

The vulnerability scanning process typically begins with network and asset discovery, mapping active devices and services. Data is then collected either unauthenticated, mimicking an external attacker's perspective, or authenticated, using administrative credentials for deeper data extraction. Authenticated scans provide more accurate results by identifying software patch levels and configurations, among other details.

At the core of a scanner is an engine that compares collected system data against vulnerability databases. It identifies known vulnerabilities, such as those cataloged by CVE (Common Vulnerabilities and Exposures). Identified vulnerabilities are often assigned risk scores using established frameworks like CVSS (Common Vulnerability Scoring System) and EPSS (Exploit Prediction Scoring System). These scores assist organizations in prioritizing remediation efforts based on attack vectors and potential impact.

Picus Security emphasizes that while standardized scoring systems are crucial, they may not always account for environmental context, such as system criticality or existing compensating controls. The company indicates that future work will explore context-aware and threat-informed prioritization methods that could enhance cybersecurity effectiveness.

Finally, the tool generates a report detailing the vulnerabilities found, their risk levels, and recommended remediation actions. These reports are customizable and can be integrated with other security management platforms, thereby supporting an organization's cybersecurity processes.