Web Application Firewalls (WAF) protect web applications from common attacks including SQL injection, XSS, and DDoS. WAFs analyze HTTP traffic and block malicious requests before they reach the application.
Cloudflare WAF
Cloudflare offers the most accessible WAF. Integrated with CDN and DDoS protection. Managed rule sets for OWASP Top 10. Rate limiting and bot management. Free tier includes basic WAF rules. Pay-as-you-go pricing.
AWS WAF
AWS WAF integrates with CloudFront, ALB, API Gateway, and AppSync. Managed rule groups from AWS and third parties. Custom rules using JSON. Web ACLs for fine-grained access control. Pricing per rule and per request.
ModSecurity
ModSecurity is the leading open-source WAF engine. It works with Apache, Nginx, and IIS. Core Rule Set (CRS) provides OWASP Top 10 protection. Highly customizable. Requires manual configuration and tuning.
Akamai WAF
Akamai App & API Protector provides enterprise WAF with edge delivery. Advanced bot management and API protection. Machine learning-based attack detection. High cost. Best for large enterprises with global traffic.
Choosing
Use Cloudflare for most web applications. Use AWS WAF for AWS-native architectures. Use ModSecurity for self-hosted, cost-sensitive deployments. Use Akamai for large enterprises with global traffic and compliance requirements.
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