Nuclei
Community-Powered Vulnerability Scanner
About Nuclei
Nuclei is an open-source, template-based vulnerability scanner by ProjectDiscovery that uses community-powered YAML templates to identify security vulnerabilities across applications, APIs, cloud infrastructure, and networks. With 12,000+ templates maintained by 900+ contributors and a single Go binary, it delivers near-zero false positives and integrates seamlessly into CI/CD pipelines.
Pros & Cons
Pros
- Massive library of 12,000+ community-maintained templates continuously updated with emerging threats
- Extremely fast scanning with Go-based concurrency turning days of work into minutes
- Near-zero false positives from template-based matching against specific known conditions
- Completely free and MIT-licensed with no restrictions on commercial use
- Easy CI/CD integration with single binary and structured JSON/SARIF output
- Active community of 900+ contributors and 30,000+ GitHub stars
Cons
- Limited to known vulnerabilities — cannot discover custom logic flaws or zero-days
- Steep learning curve for writing advanced custom YAML templates
- Not a full DAST replacement — lacks automated crawling and spidering capabilities
- Running untrusted community templates without validation can introduce security risks
- Enterprise cloud pricing is opaque and requires contacting sales
Key Features
Template-Based Detection
YAML templates define security checks across HTTP, DNS, TCP, SSL, WebSocket, and headless browser protocols
12,000+ Community Templates
Maintained by 900+ contributors covering CVEs, misconfigurations, default credentials, and exposures
Multi-Protocol Scanning
Tests web apps, APIs, DNS, network services, SSL/TLS, and cloud infrastructure from a single tool
CI/CD Integration
Single Go binary with JSON and SARIF output for automated security checks in pipelines
AI Template Editor
Generate vulnerability detection templates from natural language descriptions
Near-Zero False Positives
Template-driven matching against specific conditions produces highly accurate results
Rapid CVE Coverage
5-hour detection time for critical CVEs compared to 2-5 days for legacy scanners
Cloud Dashboard
Web-based interface for managing scans, assets, and results with team collaboration
Pricing
- Full CLI scanner
- All 12,000+ community templates
- MIT license
- CI/CD integration
- JSON/SARIF output
- 1 monthly scan
- Basic cloud dashboard
- Limited asset count
- Community support
- Continuous scanning
- SAML/OIDC SSO
- RBAC with custom permissions
- Audit trails
- Private connectivity
- Dedicated infrastructure
- SOC 2 Type II
Best For
CI/CD Security Scanning
Automatically scan every build and deployment for known CVEs and misconfigurations before production
Attack Surface Monitoring
Map external assets and continuously scan for new exposures across domains and subdomains
Cloud Infrastructure Auditing
Scan AWS, GCP, and Azure for misconfigurations and insecure default settings
Penetration Testing Automation
Bug bounty hunters rapidly triage large target lists identifying known vulnerabilities
Compliance Checks
Run templated checks against server configurations and security headers for compliance baselines
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Featured In
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Best open-source vulnerability scanner for small teams — 12,000+ detection templates, near-zero false positives, and CI/CD-ready output make it the most practical free alternative to commercial scanners.
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The essential bug bounty scanner — fast, accurate, free, and backed by the largest community-maintained vulnerability template library