zaproxy
ZAP (Zed Attack Proxy) by Checkmarx is a free, open-source web application security scanner that automatically identifies vulnerabilities during development and testing. It serves both developers seeking continuous security checks and penetration testers performing manual assessments.
Key facts
Objective fields from the source. Values we can't verify are shown as “Unknown” rather than guessed.
| Field | Value |
|---|---|
| Repository | zaproxy/zaproxy |
| Owner | zaproxy |
| Primary language | Java |
| License | Apache-2.0 — OSI-approved |
| Stars | 15.4k |
| Forks | 2.6k |
| Open issues | 863 |
| Latest release | v2.17.0 (2025-12-15) |
| Last updated | 2026-07-07 |
| Source | https://github.com/zaproxy/zaproxy |
What zaproxy is
Java-based DAST (Dynamic Application Security Testing) tool that performs automated scanning of web applications to detect security vulnerabilities. Offers both GUI and headless modes, supporting integration into CI/CD pipelines and manual testing workflows.
Get the zaproxy source
Clone the repository and explore it locally.
git clone https://github.com/zaproxy/zaproxy.gitcd zaproxy# follow the project's README for install & configurationNeed it deployed, integrated, or customized instead? DEV.co ships production installs.
Best use cases
Implementation considerations
- Requires Java runtime environment; assess resource footprint (CPU, memory) for CI/CD and local developer use.
- Learning curve for advanced features (fuzzing, custom scripts, tamper rules); plan training or documentation review for team.
- Vulnerability detection accuracy depends on application architecture, authentication setup, and crawlability; may require tuning for single-page applications.
- No built-in report standardization; integrate with external reporting/ticketing systems if you need centralized vulnerability tracking.
- Community-driven; production support and SLAs not available from Checkmarx without commercial agreement.
When to avoid it — and what to weigh
- Requires Source Code Analysis — ZAP is a DAST tool (black-box testing). If you need static code analysis or SAST capabilities, use a complementary tool like SonarQube or Semgrep.
- Heavy Dependency on Managed SaaS — ZAP is self-hosted only. If your organization requires fully managed, cloud-hosted vulnerability scanning with vendor support SLAs, consider commercial SaaS alternatives.
- Mission-Critical Compliance Audits Alone — While capable, ZAP lacks formal compliance attestation and vendor-provided audit trails. Pair with documented processes or commercial tools for regulated compliance requirements.
- Non-HTTP Protocol Testing — ZAP focuses on HTTP/HTTPS web applications. Other protocols (gRPC, GraphQL at scale, WebSockets) may require additional configuration or alternative tooling.
License & commercial use
Apache License 2.0 (Apache-2.0): permissive OSI-approved license. Source code use, modification, and private deployment are permitted. Requires retention of license and copyright notices.
Apache 2.0 permits commercial use. However, commercial support, SLAs, vulnerability advisory integration, and premium features are not included in the open-source distribution. Checkmarx offers commercial variants (e.g., ZAP Pro, Checkmarx One); review whether your use case requires vendor support before deployment.
DEV.co evaluation signals
Editorial assessment — not user reviews. Directional, with an explicit confidence level.
| Signal | Assessment |
|---|---|
| Maintenance | Active |
| Documentation | Adequate |
| License clarity | Clear |
| Deployment complexity | Low |
| DEV.co fit | Good |
| Assessment confidence | High |
ZAP is a security scanner; verify scanning parameters to avoid denial-of-service on target applications. Community-driven project: publicly disclosed vulnerabilities may be visible before patch release. Run scans in isolated environments to avoid network exposure. No formal vulnerability disclosure program stated in README; monitor GitHub security advisories.
Alternatives to consider
Burp Suite Community / Professional
Commercial-grade DAST tool with stronger GUI, broader protocol support, and vendor support. Community edition is free; Professional requires licensing for advanced features.
OWASP Nuclei
Template-driven vulnerability scanner with simpler deployment and fast scanning. Lighter-weight alternative for specific vulnerability classes; less interactive testing capability.
Checkmarx One / CxAST
Commercial unified SAST + DAST + SCA platform by ZAP's maintainer. Offers managed SaaS, dedicated support, and integrated compliance reporting for regulated environments.
Build on zaproxy with DEV.co software developers
Assess ZAP's fit for your development and compliance requirements. Our team can help you evaluate deployment options, CI/CD integration, and alternative commercial tools.
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zaproxy FAQ
Can ZAP be used in production scanning?
Does ZAP support authentication flows?
What reporting formats does ZAP provide?
Is commercial support available?
Custom software development services
DEV.co helps companies turn open-source tools like zaproxy into production software. Our software development services cover the full lifecycle — architecture, web development, integration, and maintenance — delivered by software developers and web developers who ship. Engage our software development agency to implement or customize it for your open-source security stack.
Ready to Integrate ZAP into Your Security Workflow?
Assess ZAP's fit for your development and compliance requirements. Our team can help you evaluate deployment options, CI/CD integration, and alternative commercial tools.