Cloudflare WAF vs ModSecurity
A detailed comparison to help you choose between Cloudflare WAF and ModSecurity.
Quick Verdict
3.5/5
Cloudflare WAF
249 reviews
4.0/5
ModSecurity
250 reviews
ModSecurity is rated higher (4.0 vs 3.5). Cloudflare's Web Application Firewall protects against OWASP Top 10, zero-day vulnerabilities, and DDoS. 300+ global PoPs absorb attacks. Free plan blocks basic threats; Pro adds OWASP managed rules. ModSecurity is a free WAF engine that detects and blocks malicious HTTP requests. Operates as a module for major web servers to protect against OWASP Top 10 attacks and custom threats.
Cloudflare WAF Web Application Firewall protecting millions of sites | ModSecurity Open-source web application firewall for Apache, Nginx, and IIS | |
|---|---|---|
| Overview | ||
| Rating | 3.5 (249 reviews) | 4.0 (250 reviews)✓ |
| Pricing model | freemium | free |
| Starting price | Free tier available | Free |
| Best for | Every website — Cloudflare WAF is the standard baseline for web application firewall protection | DevOps teams and system administrators running self-managed web servers who need application-layer protection without managed WAF costs. |
| Tags | ||
| Tags | free tierddos protectionapi accesseu datacenterus datacenterapac datacenter | free tieropen sourceself hostable |
| Visit Cloudflare WAF → | Visit ModSecurity → | |
Cloudflare WAF
Pros
- + Free WAF rules on all plans
- + DDoS mitigation up to 142Tbps
- + 300+ PoP global network absorbs attacks
Cons
- - Advanced WAF rules require Pro+ plan
- - Some legitimate traffic can be blocked
ModSecurity
Pros
- + Deploy on-premises with full control and visibility
- + Use industry-standard OWASP Core Rule Set or create custom rules
- + Inspect request/response payloads, headers, and cookies in real-time
- + Free and open-source with active community support
Cons
- - Requires server-level integration and maintenance expertise
- - Rule tuning needed to avoid false positives in production
- - No built-in DDoS rate-limiting or volumetric attack mitigation
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