Vulnerability Scan

A vulnerability scan is an automated process for systematically identifying known security vulnerabilities in IT systems, networks, and applications. Unlike a penetration test, vulnerabilities are not actively exploited but detected and assessed by comparison against current vulnerability databases (CVE, NVD, Vendor Advisories). This enables rapid, comprehensive security analysis even without time-intensive manual testing.

Modern vulnerability scanners such as Tenable Nessus, Qualys VMDR, or Rapid7 InsightVM use authenticated and unauthenticated scan modes. Authenticated scans provide a significantly more complete picture as they can directly access installed software versions and patch levels — unauthenticated scans cover the externally visible attack surface as an attacker without prior credentials would see it.

Blackfort Technology does not conduct vulnerability scans as a pure tool service. Our approach is based on interpreted results: we analyze raw scanner outputs, filter false positives, prioritize by CVSS v3.1 and EPSS score as well as your specific IT landscape, and deliver action recommendations that your team can implement directly.

A professional vulnerability scan begins with a structured scoping phase: we jointly define the scope of investigation — which IP ranges, domains, applications, or cloud tenants should be covered? Are authenticated or unauthenticated scans needed? During which time windows may the scan run? This upfront coordination ensures the scan covers exactly the systems and perspectives relevant to your risk profile — without blind spots and without unnecessary operational disruptions.

After the scan, the scanner delivers raw result lists with often thousands of potential findings. This raw data is not actionable without expert knowledge: typical false positive rates range from 15–40% depending on scanner and environment. Blackfort cleans the results manually, verifies critical findings, and prioritizes by CVSS v3.1, EPSS score (Exploit Prediction Scoring System), and the actual reachability and asset criticality of each affected system in your specific infrastructure.

The result is a two-part scan report: an executive summary with overall risk status, the most critical findings, and prioritized immediate actions in non-technical language — plus a technical appendix with all verified vulnerabilities, CVSS scores, affected systems, and concrete remediation instructions for your operations team. On request, we support with follow-up tracking and conduct a verification re-scan after completed remediation.

External Network Scan: We scan your externally reachable IP addresses and domains and identify exposed services, outdated software versions, and misconfigured systems. This scan maps the view of an attacker from the internet and is particularly relevant for companies with a broad online presence or remote access infrastructure.

Internal Network Scan: An authenticated scan within your network infrastructure uncovers vulnerabilities available to an internal attacker or compromised system. Beyond classic server and client systems, we also scan network devices, printers, and OT/IoT components. Results are prioritized by criticality and exploitability.

Web Application Scan: Using dynamic application security testing (DAST) tools, we check web applications and APIs against the OWASP Top 10 and beyond. For critical applications, we combine automated scans with targeted manual review to eliminate the high false positive rate of pure DAST tools. Results are assessed by business impact.

Three vulnerability scanners dominate the enterprise market: Tenable Nessus / Tenable.io has the largest plugin database (over 180,000 plugins) and reliably detects known CVEs even in heterogeneous environments with legacy systems. Qualys VMDR (Vulnerability Management, Detection and Response) uses a cloud-based, agentless approach with continuous asset inventory — particularly strong for large, distributed infrastructures. Rapid7 InsightVM combines vulnerability scanning with integrated remediation workflows and can be directly connected to ticketing systems like Jira or ServiceNow. Each scanner has specific strengths — tool selection always depends on the infrastructure, the scan target, and available integration paths.

Open-source vulnerability scanners like OpenVAS (now: Greenbone Community Edition) offer a cost-effective alternative for smaller environments. However, plugin coverage is significantly narrower, enterprise support is absent, and the false positive rate is noticeably higher than commercial tools — which massively increases manual cleanup effort. For web applications, Nikto is a common open-source scanner for targeted individual checks, but does not replace a complete DAST analysis. Bottom line: open-source scanners are suitable for orientation screening in non-critical environments, not for audit-ready compliance evidence or regulated infrastructures.

Choosing the right vulnerability scanner is only the first step. Decisive is the interpretation of results: every commercial scanner produces raw data that is not actionable without expert knowledge. Blackfort deploys different scanner tools based on scope and customer environment — and delivers instead of raw data a verified, prioritized, and annotated analysis that your team can implement directly.

Cloud environments require a different scan approach than on-premises infrastructure. Beyond classical network scans of cloud workloads, configuration analyses (CSPM — Cloud Security Posture Management) are critical: misconfigured S3 buckets, overprivileged IAM roles, or unencrypted storage volumes are typical vulnerabilities that no CVE-based scanner finds.

Blackfort conducts cloud security assessments for AWS, Microsoft Azure, and Google Cloud. We combine automated CSPM analyses (e.g., Prowler, Scout Suite, Microsoft Defender for Cloud) with manual configuration review and deliver a prioritized action catalog. The assessment also covers multi-cloud and hybrid environments.

For companies that need a continuous vulnerability scanning service, we offer managed vulnerability scanning as a subscription: regular scans, consolidated dashboard, trend reporting, and proactive alerting on newly discovered critical vulnerabilities (zero-day monitoring).

Regular vulnerability scans are explicitly required or implicitly expected in numerous regulatory frameworks: ISO 27001 (A.12.6.1 – Management of technical vulnerabilities), NIS2 Implementation Act (technical security measures), DORA (ICT risk management and vulnerability testing), PCI DSS v4.0 (Requirement 11.3 – Internal and External Vulnerability Scans), and BSI IT-Grundschutz.

For companies seeking certification or with regulatory evidence obligations, we create scan reports in audit-ready format. For PCI DSS-obligated companies, we coordinate external scans through an ASV (Approved Scanning Vendor) and support with the Attestation of Compliance.

A vulnerability scan alone does not replace a penetration test. We recommend running vulnerability scans as a continuous hygiene measure and complementarily conducting at least one manual penetration test per year — especially after significant infrastructure changes or new application versions.