Top 7 Web Vulnerability Scanners: Features, Pros, and How to Use Them

After gathering information in a penetration test, scanning for common web vulnerabilities such as SQL injection, XSS, file upload, and command execution is essential. Below is an overview of seven widely used web vulnerability scanners, their main capabilities, typical usage scenarios, and screenshots of their interfaces.

1. Acunetix Web Vulnerability Scanner (AWVS)

AWVS is a commercial web vulnerability scanner that crawls a target site, detects popular security flaws, and presents results with severity levels. A free 14‑day trial is available; otherwise a license must be purchased. The screenshot shows the main dashboard with two scanned sites, reporting 4 high‑risk, 4 medium‑risk, and 20 low‑risk findings.

2. Nessus

Nessus is the most widely deployed system vulnerability scanner, used by over 75,000 organizations. It offers both free trial and paid editions. The interface screenshot shows two previously scanned sites and lists detected vulnerabilities.

3. w3af

w3af is an open‑source web application attack and audit framework with over 130 plugins covering crawling, SQL injection, XSS, LFI, RFI and more. It runs primarily on Linux and can be integrated into the Kaili platform. A Windows version is also available.

4. OWASP ZAP

OWASP Zed Attack Proxy (ZAP) is a free, community‑maintained security testing tool. It provides a local proxy, active and passive scanning, fuzzing, and brute‑force modules. Users can start a scan by entering a target URL in the attack address bar.

5. Yujian (Backend Scanner)

Yujian is a specialized backend scanning tool that discovers admin login paths and includes a customizable dictionary. Users input a domain, optionally select the target language, and configure thread count. The scanner probes common directories and scripts, reporting up to 200 discovered paths by default.

6. Polar Bear

Polar Bear is an integrated crawler and vulnerability scanner. After crawling a site, the results can be fed into a detection module for further analysis. Users can adjust options based on prior information to improve scanning efficiency.

7. Test404

Test404 is a practical website vulnerability detector similar to 360 Site Security Check. It analyzes a target domain, lets users select scanning threads and backend language, and presents identified security issues.

The tools listed represent only a subset of available scanners; many others exist. Regardless of the tool, ethical use is emphasized: the knowledge should support network security, not illegal activities.