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Nuclei is an open-source, template-based vulnerability scanner that leverages community-driven detection patterns for high-speed automated security testing.
About
Nuclei stands as ProjectDiscovery's flagship open-source vulnerability scanner, designed around a template-based architecture that enables rapid and scalable security testing. The platform operates on a community-driven model where security researchers and practitioners contribute detection templates, creating an extensive library of vulnerability patterns. This collaborative approach ensures the scanner remains current with emerging threats and attack vectors.
The tool's core strength lies in its template engine, which allows users to define custom detection logic using simple YAML syntax. These templates can identify everything from basic misconfigurations to complex multi-step attack chains. The scanner supports various protocols including HTTP, DNS, TCP, and file-based checks, making it versatile for different testing scenarios.
Nuclei's high-speed automation capabilities set it apart from traditional vulnerability scanners. The platform can process thousands of targets simultaneously through its efficient concurrency model. Built-in rate limiting and retry mechanisms ensure reliable scanning without overwhelming target systems. Integration capabilities include CI/CD pipelines, cloud environments, and popular security orchestration platforms.
Key features include:
- Template-based detection engine with YAML configuration
- Community-maintained template library with thousands of checks
- Multi-protocol support (HTTP, DNS, TCP, file systems)
- High-speed concurrent scanning with rate limiting
- Custom template creation and modification capabilities
- Integration with CI/CD and security automation workflows
Security teams, penetration testers, and bug bounty hunters rely on Nuclei for continuous security validation and vulnerability discovery. The tool serves organizations ranging from startups to enterprises seeking scalable vulnerability assessment capabilities. Its lightweight architecture makes it suitable for both one-off security assessments and ongoing monitoring programs.
Within the broader cybersecurity ecosystem, Nuclei complements traditional vulnerability management platforms by providing rapid, customizable detection capabilities. The active community contribution model ensures the tool evolves with the threat landscape, making it a valuable component of modern security testing arsenals.