Kong Gateway WAF vs NAXSI
Kong Gateway WAF and NAXSI take different approaches to web application security. Consider your team's expertise and infrastructure preferences when evaluating these options.
Kong Gateway WAF and NAXSI take fundamentally different approaches to web application security. Understanding your infrastructure and team capabilities will help determine which approach fits your needs.
Overview
Kong Gateway WAF and NAXSI are both popular web application firewall solutions. This comparison will help you understand the key differences and choose the right one for your needs.
API gateway with built-in WAF plugin for enterprise customers. Kong is the most popular open source API gateway (35K+ GitHub stars, 312M+ downloads) built on NGINX, processing 400B+ API calls daily. The WAF plugin is an Enterprise-only add-on that protects API endpoints at the gateway layer.
A lightweight, open source WAF module for NGINX that uses a scoring-based approach instead of signature matching, blocking attacks by detecting suspicious patterns rather than maintaining a vulnerability database.
Quick Comparison
| Feature | Kong Gateway WAF | NAXSI |
|---|---|---|
| Overall Rating | 3.8/5 | 3.4/5 |
| Free Tier | No | Yes |
| Pricing Model | Tiered (Plus per-gateway + Enterprise custom) | Free (Open Source, GPLv3) |
| Ease of Use | 3.2/5 | 2.8/5 |
| Value for Money | 3.0/5 | 4.5/5 |
| Support | 4.2/5 | 2.5/5 |
| Open Source | No | Yes |
| Platforms | Linux (Ubuntu, RHEL, Debian, Amazon Linux, Alpine), Docker, Kubernetes (via Ingress Controller and Operator), AWS, Azure, GCP, ARM64, macOS (dev) | NGINX, Linux (Debian, Ubuntu, CentOS), FreeBSD, OpenBSD, NetBSD, Docker |
| Compliance | SOC 2 Type II, FIPS 140-2 (Enterprise data planes), supports PCI DSS and HIPAA compliance | N/A (supports OWASP Top 10 protection patterns) |
Pricing Comparison
Kong Gateway WAF
Model: Tiered (Plus per-gateway + Enterprise custom)
Kong Gateway OSS
Free
Kong Konnect Plus
From $225/mo
Kong Konnect Enterprise
Custom (annual)
Dedicated Cloud Gateway
$500/mo per control plane + $0.15/GB
Features Comparison
Kong Gateway WAF
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Gateway-Embedded WAF
WAF runs as a plugin inside the Kong Gateway process, inspecting API traffic at the same layer where routing, authentication, and rate limiting occur. No separate WAF appliance or additional proxy hop needed.
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OWASP Top 10 Protection
Built-in protection against common web application attacks including SQL injection, cross-site scripting, command injection, and path traversal at the API gateway layer.
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Plugin Ecosystem
Over 100 plugins for security, traffic control, authentication, and observability. WAF works alongside bot detection, IP restriction, CORS, ACL, and rate limiting plugins in a configurable execution chain.
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Third-Party WAF Integrations
Open plugin architecture supports third-party WAF engines including open-appsec (ML-driven detection) and Wallarm (API security). Teams can choose the WAF engine that fits their threat model.
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Kubernetes-Native Deployment
Kong Ingress Controller and Kong Kubernetes Operator provide native Kubernetes integration. WAF policies can be managed declaratively through Kubernetes CRDs alongside gateway configuration.
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Hybrid Mode
Cloud-managed control plane with self-hosted data planes. WAF policies are centrally managed and distributed to data planes running in any environment, including air-gapped networks.
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AI Gateway
Dedicated AI gateway capabilities including LLM proxy, token-based rate limiting, semantic caching, PII sanitization, prompt guardrails, and MCP server proxy. WAF protects AI endpoints alongside traditional APIs.
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Declarative Configuration
Gateway and WAF configuration can be managed as code through declarative YAML/JSON, enabling GitOps workflows and CI/CD pipeline integration for security policy changes.
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Advanced Rate Limiting
Enterprise-grade rate limiting with sliding window counters, consumer groups, and cluster-wide synchronization. Works in conjunction with WAF to prevent both application-layer attacks and abuse.
NAXSI
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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.
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Learning Mode
Monitors traffic and automatically generates whitelist rules for legitimate application behavior, reducing manual tuning effort during initial deployment.
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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.
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Deny-by-Default
Operates like a DROP firewall. Common attack characters and patterns are blocked unless explicitly whitelisted for the target application.
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Lightweight Footprint
Written in C with only libpcre as a dependency. Adds minimal overhead to NGINX request processing.
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Dynamic Module Support
Can be compiled as a dynamic NGINX module, allowing it to be loaded without recompiling NGINX from source.
Which One Is Right for You?
The best WAF depends on your specific requirements, infrastructure, and team expertise.
Kong Gateway WAF
- You need: Organizations already using Kong as their API gateway, Kubernetes-native architectures needing gateway-level WAF, teams wanting unified API management and security in one platform, enterprises with microservices architectures routing all traffic through an API gateway
- You're using: Linux (Ubuntu, RHEL, Debian, Amazon Linux, Alpine), Docker, Kubernetes (via Ingress Controller and Operator), AWS, Azure, GCP, ARM64, macOS (dev)
NAXSI
- You need: Teams already running NGINX who want lightweight inline WAF protection, budget-conscious deployments, applications with predictable request patterns, virtual patching use cases
- You want to start with a free tier
- You prefer open-source solutions
- You're using: NGINX, Linux (Debian, Ubuntu, CentOS), FreeBSD, OpenBSD, NetBSD, Docker
We recommend evaluating both options with a trial or free tier before committing. Consider your existing infrastructure, team expertise, compliance requirements, and budget.
Frequently Asked Questions
Which is better for startups: Kong Gateway WAF or NAXSI?
NAXSI offers a free tier while Kong Gateway WAF does not, making NAXSI more accessible for budget-conscious startups. Kong Gateway WAF scores higher for ease of use (3.2/5), which is valuable for smaller teams. Consider your immediate security needs and growth plans when choosing.
Which has better support: Kong Gateway WAF or NAXSI?
Kong Gateway WAF has a higher support rating (4.2/5) compared to NAXSI (2.5/5). However, support quality can vary based on your plan tier - enterprise customers typically receive more responsive support from both providers. Consider evaluating support during a trial period.
Which is easier to implement: Kong Gateway WAF or NAXSI?
Kong Gateway WAF scores higher for ease of use (3.2/5) versus NAXSI (2.8/5). The actual implementation effort depends on your existing infrastructure and team expertise.
Which is more cost-effective: Kong Gateway WAF or NAXSI?
NAXSI offers a free tier while Kong Gateway WAF requires a paid plan. NAXSI scores higher for value (4.5/5). Total cost depends on your traffic volume, required features, and support level needs.
Which works better with AWS: Kong Gateway WAF or NAXSI?
Kong Gateway WAF explicitly supports AWS while NAXSI's AWS integration may vary. Consider whether native AWS integration or cross-cloud portability matters more for your use case.