ModSecurity is an open source WAF available as a module for Apache and Nginx. It offers rule customisation and active community support, suited for cost-conscious and technically capable teams.
| Pricing from | Free |
| Best for | Cost-conscious organisations with internal security expertise and technical resources |
| Website | modsecurity.org/ |
Strengths and trade-offs
- Completely free with full transparency of code and rules
- Highly customisable for specific application requirements
- Requires significant technical expertise to deploy and tune effectively
- Limited commercial support and no SLA guarantees
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