Nuclei
Fast vulnerability scanner powered by community YAML templates to scan web applications, networks, and cloud targets for known defects.
Technical Architecture & Overview
Nuclei is a fast vulnerability scanner created by ProjectDiscovery. It sends targeted requests across protocols (HTTP, DNS, TCP, SSL/TLS, WebSocket, WHOIS, File, Headless, Code, and JavaScript) based on community-curated YAML templates, designed for low-to-zero false positives via precise template matching.
Targeted Technical Use Cases
Rapid vulnerability scanning across large external attack surfaces and continuous CI/CD security checks.
Evaluation & Trade-offs
Core Strengths
- +High scan speed with concurrent protocol workers.
- +Over 12,000 community templates covering recent CVEs, misconfigurations, and default credentials.
- +YAML templates make it simple to write custom organizational detection rules.
Trade-Offs & Limitations
- -Template-based approach requires maintaining and updating template repositories.
- -Finds only what its templates describe, so application-specific logic flaws need custom templates or manual testing.
Defensive Security Application
Scanning enterprise perimeters immediately after major CVE disclosures to identify unpatched assets.
Frequently Asked Questions
What is Nuclei?→
Nuclei is a fast vulnerability scanner created by ProjectDiscovery. It sends targeted requests across protocols (HTTP, DNS, TCP, SSL/TLS, WebSocket, WHOIS, File, Headless, Code, and JavaScript) based on community-curated YAML templates, designed for low-to-zero false positives via precise template matching.
What is Nuclei used for?→
Rapid vulnerability scanning across large external attack surfaces and continuous CI/CD security checks.
What are the strengths of Nuclei?→
- +High scan speed with concurrent protocol workers.
- +Over 12,000 community templates covering recent CVEs, misconfigurations, and default credentials.
- +YAML templates make it simple to write custom organizational detection rules.
What are the limitations of Nuclei?→
- +Template-based approach requires maintaining and updating template repositories.
- +Finds only what its templates describe, so application-specific logic flaws need custom templates or manual testing.
How is Nuclei used defensively?→
Scanning enterprise perimeters immediately after major CVE disclosures to identify unpatched assets.