What is security scanning in cybersecurity?

Security scanning is the automated testing of web applications, networks, DNS records, and infrastructure to find vulnerabilities and misconfigurations. Scanners probe assets and report findings so teams can fix issues before attackers exploit them.

What is the difference between security scanning and vulnerability assessment?

Security scanning detects and lists potential weaknesses. Vulnerability assessment validates those findings, scores them by risk, and prioritizes which to fix first. Scanning is usually the first step inside a broader vulnerability assessment process.

How often should I run security scans?

Most teams run scans on a scheduled basis, such as daily or weekly, and also trigger scans after any significant infrastructure or code change. Continuous or frequent scanning reduces the window between a misconfiguration being introduced and being discovered.

Can security scanners test behind a login?

Some scanners support authenticated scanning, where you provide session credentials so the tool can test pages and functions that require a login. Not all tools support this, so check the feature list if your application has significant authenticated functionality.

What is Security Scanning?

Security Scanning is the automated process of probing web applications, networks, DNS configurations, and infrastructure to detect vulnerabilities, misconfigurations, and malicious content before attackers can exploit them. It is used by security teams to get a continuous, low-effort view of their attack surface.

What it does

Security scanning tools automatically test systems and assets for known weaknesses. Depending on the tool, a scanner may:

Crawl web applications and test for common vulnerabilities such as those in the OWASP Top 10
Probe open ports and services on networks using engines like Nmap
Check DNS records, TLS certificates, and email authentication settings for misconfigurations
Enumerate subdomains and exposed directories
Submit URLs or files to detect phishing pages, malware, or malicious content
Query external data sources such as Shodan to find internet-exposed assets

Scans can be triggered on demand, scheduled on a recurring basis, or run as part of a CI/CD pipeline. Results are typically presented as a list of findings with severity ratings and remediation guidance.

Why teams buy it

Security scanning sits inside the broader Threat and Vulnerability Management category. Teams use it because manual testing cannot keep pace with the rate of change in modern infrastructure. Key reasons include:

Finding misconfigurations in DNS, TLS, and email authentication before they are abused
Identifying vulnerable web application endpoints without waiting for a penetration test
Monitoring WordPress sites and other CMS platforms for newly introduced weaknesses
Screening uploaded files and URLs for malware through API-based services
Getting a fast, low-cost first pass before deeper Vulnerability Assessment work begins

What to look for

When evaluating a security scanning tool, consider:

Coverage: Does it cover the asset types you care about, such as web apps, DNS, networks, or file uploads?
Integration: Can it connect to your existing stack via API, CLI, or plugin?

What is Security Scanning?

What it does

Why teams buy it

What to look for

Common confusions

Security Scanning tools

Frequently asked questions