What’s the difference between a vulnerability scanner and a penetration test?

A vulnerability scanner automates the discovery of known issues across a wide scope, while a penetration test is a manual, targeted assessment performed by security experts to simulate real-world attacks. Both approaches are complementary.

How does an automated vulnerability scanner work?

An automated vulnerability scanner sends requests that mimic attacker behavior and evaluates how the application responds. If the response indicates a weakness, the scanner reports the vulnerability along with details to help reproduce and fix it.

What vulnerabilities can Acunetix detect?

Acunetix detects a broad range of web application and API vulnerabilities, including SQL injection, cross-site scripting, authentication issues, misconfigurations, exposed resources, and other exploitable flaws commonly found in modern applications.

Vulnerability Scanner – Automated Web App Security Testing

Q: What is a vulnerability scanner?

A vulnerability scanner is an automated security tool that tests systems for known weaknesses by sending crafted inputs and analyzing responses. It helps identify vulnerabilities that could be exploited by attackers.

Improve your application security with the Acunetix vulnerability scanner

Acunetix is a vulnerability scanner designed to help organizations identify, validate, and fix security vulnerabilities in their web applications and APIs. By combining automated scanning with built-in validation, it enables security teams to focus on real, exploitable risks rather than chasing false positives.

Modern vulnerability scanning tools cover a wide range of systems, from operating systems and open ports to cloud infrastructure and applications. Acunetix is purpose-built for the web layer – testing running applications and APIs from the outside in, as hackers would during a cyberattack.

With support for thousands of known vulnerabilities and CVEs, automated proof of exploit for many findings, and integrations across development workflows, Acunetix strengthens your security posture and helps reduce the risk of a data breach.

What is a vulnerability scanner?

A vulnerability scanner is a cybersecurity tool that automatically tests systems for security gaps and known weaknesses. It sends crafted requests to a target system and analyzes responses to identify vulnerabilities that could be exploited by attackers.

There are several types of vulnerability scanners, including:

Network vulnerability scanners that assess infrastructure, open ports, and firewall exposure
Cloud and container scanners that evaluate modern environments
Software composition analysis tools that identify vulnerable dependencies
Web application and API scanners that test running applications for exploitable flaws

Acunetix focuses on web application and API vulnerability scanning using dynamic application security testing (DAST). This approach analyzes applications in their running state, helping with identifying vulnerabilities that are actually exposed and reachable by cyber threats.

What to look for in a web and API vulnerability scanner

Not all vulnerability scanning tools are equally effective for modern applications. When evaluating a solution, several capabilities make a measurable difference:

Accuracy and validation

Automated scanning often produces large volumes of results, many of which require manual verification. Look for tools that support reliable vulnerability detection and validation. Acunetix uses proof-based scanning to confirm many findings, reducing noise and supporting efficient vulnerability management.

Coverage of modern applications and APIs

Today’s applications rely heavily on JavaScript frameworks and APIs. A scanner must handle complex functionality, authentication flows, and API endpoints to provide meaningful attack surface coverage.

Depth of testing

Effective vulnerability assessment depends on reaching all relevant parts of an application, including authenticated areas and business logic. Without this depth, critical security vulnerabilities may remain hidden.

Automation and integration

To support DevSecOps workflows, scanning must integrate with CI/CD pipelines and issue tracking systems. Real-time or near real-time feedback helps teams respond quickly to emerging cyber threats.

Actionable remediation and prioritization

Security professionals need more than raw findings. Clear prioritization and remediation guidance help teams fix issues efficiently and close security gaps faster.

Why choose Acunetix for vulnerability scanning?

Acunetix is a DAST-first vulnerability scanner built to identify and validate security vulnerabilities in running web applications and APIs. It helps organizations reduce risk by focusing on vulnerabilities that can actually be exploited.

Focus on real, exploitable risk

By testing applications from the outside in, Acunetix identifies vulnerabilities that are visible within your attack surface. This perspective aligns with how hackers operate and supports better prioritization.

Built-in validation to reduce false positives

Acunetix uses proof-based scanning to automatically confirm many vulnerabilities. This improves vulnerability detection accuracy and reduces time spent verifying results.

Broad vulnerability coverage

The scanner detects a wide range of issues, including injection flaws, cross-site scripting (XSS), authentication weaknesses, misconfigurations, and API vulnerabilities. It helps organizations address risks aligned with industry standards and common vulnerability databases.

Support for modern architectures

Acunetix is designed for modern SaaS and web environments, including dynamic applications and API-driven architectures. It can test complex functionality across distributed systems.

Scalable and flexible deployment

Organizations can deploy Acunetix on premises or as a SaaS solution and scale scanning capacity as needed. This flexibility supports both small teams and enterprise security programs.

Automate vulnerability scanning across your SDLC

To keep up with modern development cycles, vulnerability scanning must be continuous and integrated into existing workflows.

Acunetix supports:

Integration with CI/CD pipelines for automated scanning
Connections to issue trackers such as Jira, GitHub, and GitLab for streamlined vulnerability management
APIs for extending functionality and integrating with internal tools
Distributed scanning to handle large and complex environments

By embedding vulnerability assessment into the software development lifecycle, security teams and developers can identify vulnerabilities earlier and reduce the likelihood of successful cyberattacks.

To see how Acunetix fits into your application security program, request a demo to explore its vulnerability scanning capabilities in a real-world environment.

Frequently asked questions

Why do I need vulnerability scanning?

Vulnerability scanning is the only automatic way to protect your website or web application from malicious hacker attacks. In addition, you should do manual penetration testing after a vulnerability scan. You should use web application firewalls only as temporary protection before you can fix vulnerabilities.

What does a vulnerability scanner do?

A vulnerability scanner sends special data to your website or web application – the type of data that a malicious hacker would send. However, it does it in a safe way. If the response from your website or web application shows that it can be hacked, the vulnerability scanner reports it to you and tells you how to fix it.

Learn how to set up the vulnerability scanner to scan a test web application.

How often should you run a vulnerability scan?

You should scan your website or web application every time that you change it. However, if you use ready-made web applications such as WordPress, some plugins may be updated automatically and you do not always know if someone else is introducing changes. Therefore, we recommend that you run a full scan every week and a quick scan (incremental scan and/or high severity scan) every day.

Learn how to schedule scans in Acunetix.

Which is the best vulnerability scanner?

We believe that Acunetix is the best vulnerability scanner because it is the most automated, the most efficient, and the most accurate scanner on the market. If you want to find out for yourself, test it along with other scanners.

Click here to request a demo of Acunetix.

MANAGE YOUR WEB SECURITY WITH

Acunetix vulnerability scanner for web applications and APIs