NAXSI vs F5 WAF for NGINX

NAXSI

Model: Free (Open Source, GPLv3)

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F5 WAF for NGINX

Model: Per-instance annual subscription

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NAXSI

• Scoring-Based Detection

  Assigns scores to suspicious patterns in requests. Blocks when the cumulative score exceeds a threshold, rather than relying on exact signature matches.

• Learning Mode

  Monitors traffic and automatically generates whitelist rules for legitimate application behavior, reducing manual tuning effort during initial deployment.

• Virtual Patching

  Apply custom rules to block specific vulnerabilities without modifying application code. Rules target raw requests or specific fields like headers, args, and body.

• Deny-by-Default

  Operates like a DROP firewall. Common attack characters and patterns are blocked unless explicitly whitelisted for the target application.

• Lightweight Footprint

  Written in C with only libpcre as a dependency. Adds minimal overhead to NGINX request processing.

• Dynamic Module Support

  Can be compiled as a dynamic NGINX module, allowing it to be loaded without recompiling NGINX from source.

F5 WAF for NGINX

• 7,800+ Attack Signatures

  F5's comprehensive threat signature database with continuous updates from F5's threat research team. Covers OWASP Top 10, CVE-specific signatures, and application-specific attack patterns.

• Declarative Security Policies

  WAF policies defined in JSON or YAML, designed for version control and CI/CD integration. Security-as-code approach where policies deploy alongside application code through the same pipelines.

• API Security

  Import OpenAPI/Swagger specifications to automatically enforce API contracts. Schema validation, parameter type checking, and rate limiting for REST, GraphQL, and gRPC APIs. Blocks requests that violate the API specification.

• ML-Powered DoS Protection

  Behavioral analytics using machine learning to detect and mitigate Layer 7 denial-of-service attacks. Learns normal traffic patterns and automatically identifies anomalous request rates, slow POST attacks, and resource exhaustion attempts.

• Bot Protection

  Multi-layered bot detection combining signature matching, anomaly detection, and behavioral analysis. Identifies credential stuffing bots, web scrapers, and automated vulnerability scanners.

• Kubernetes Ingress WAF

  Native WAF support in the NGINX Ingress Controller. Attach WAF policies to specific ingress resources for per-service or per-route security. Policies managed through Kubernetes CRDs and annotations.

• NGINX One Visual Editor

  The NGINX One console provides a GUI-based WAF policy editor, replacing the original CLI-only configuration. Security teams can create, modify, and monitor WAF policies through a web interface without writing JSON.

• Request and Response Inspection

  Inspects both incoming requests and outgoing responses. Response inspection catches data leakage, error messages that reveal application internals, and sensitive data exposure.