Overview
SafeLine is an open source web application firewall developed by Chaitin Tech, a Chinese cybersecurity company known for their CTF competition team. With over 15,000 GitHub stars, it is the most popular open source WAF project on GitHub, reflecting strong community adoption particularly in Asia-Pacific markets.
SafeLine's core differentiator is its semantic analysis engine. Rather than relying solely on regex patterns or signature matching, SafeLine analyzes the semantic meaning of HTTP requests to detect attacks. This approach claims to reduce false positives while catching attack variants that signature-based WAFs miss.
The project focuses heavily on ease of use. Deployment is a single Docker Compose command, and management happens through a built-in web dashboard. Users can configure protected sites, view attack logs, manage certificates, and adjust rules without editing configuration files. This makes it accessible to teams without deep WAF expertise.
Ratings Breakdown
Key Features
Semantic Analysis Engine
Analyzes the semantic meaning of HTTP requests rather than pattern matching, detecting attack intent even in obfuscated or novel payloads.
Web Management Dashboard
Built-in web UI for configuring protected sites, viewing attack logs, managing SSL certificates, and adjusting WAF rules without command-line access.
One-Command Deployment
Deploy with a single Docker Compose command. No complex configuration files or dependencies to manage.
Automatic SSL
Built-in Let''s Encrypt integration for automatic SSL certificate provisioning and renewal for protected sites.
Attack Analytics
Visual dashboard showing attack types, sources, frequency, and trends with detailed request logging for investigation.
Reverse Proxy Architecture
Operates as a reverse proxy, sitting in front of web applications to inspect and filter traffic before it reaches the origin server.
Pros & Cons
Pros
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Easy deployment
Single Docker Compose command gets a fully functional WAF running. No WAF expertise required for basic setup.
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Web management UI
Full graphical dashboard for management, unlike most open source WAFs that require file-based configuration.
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Semantic detection
Semantic analysis engine catches attack variants that regex-based WAFs miss, with reportedly lower false positive rates.
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Active community
15K+ GitHub stars, regular releases, and active community particularly in Asia-Pacific markets.
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Free and full-featured
Community edition includes all core WAF features without artificial limitations.
Cons
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Documentation primarily Chinese
While English documentation exists, the most detailed guides and community discussions are in Chinese.
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Limited integrations
Fewer third-party integrations compared to ModSecurity or commercial WAFs. No native K8s ingress controller support.
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Single-vendor project
Developed primarily by Chaitin Tech. Unlike OWASP projects, the roadmap is driven by a single company.
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Newer in Western markets
Well established in Asia-Pacific but less proven and less known in North American and European enterprise environments.
Pricing
Pricing model: Free community edition, paid pro edition
Community Edition
Full WAF functionality for self-hosted deployment
- Semantic analysis engine
- Web management dashboard
- SSL certificate management
- Attack logging and analytics
- Docker deployment
- Community support
Pro Edition
Enhanced features for enterprise use
- All community features
- Advanced bot protection
- Multi-node clustering
- Priority support
- Enhanced analytics
- Custom rule engine
Our Verdict
SafeLine is the easiest open source WAF to deploy and manage. The combination of Docker deployment, web UI, and semantic analysis engine makes it a strong choice for teams that want WAF protection without the complexity of configuring ModSecurity rules or managing enterprise appliances.
The semantic analysis approach is interesting and appears to deliver on its promise of lower false positives. However, the project's Chinese-language community and single-vendor development model may give some Western enterprises pause.
Our verdict: The best open source WAF for ease of use. If you want self-hosted WAF protection running in minutes with a visual management interface, SafeLine is the top choice.
CVE Coverage
SafeLine Web Application Firewall can detect and block attacks matching 90K+ known CVEs based on its supported rule sets.
Coverage by Attack Type
Latest Blockable CVEs
| CVE | Severity |
|---|---|
| CVE-2026-6606 | HIGH |
| CVE-2026-6605 | HIGH |
| CVE-2026-6604 | HIGH |
| CVE-2026-6603 | HIGH |
| CVE-2026-6602 | HIGH |
| CVE-2026-6600 | LOW |
| CVE-2026-32963 | UNKNOWN |
| CVE-2026-6596 | HIGH |
| CVE-2026-6595 | HIGH |
| CVE-2026-6594 | HIGH |
Frequently Asked Questions
How does SafeLine compare to ModSecurity?
SafeLine and ModSecurity take fundamentally different approaches. ModSecurity uses regex-based rules (SecLang) that require expertise to configure and tune. SafeLine uses semantic analysis that works out of the box with minimal configuration. SafeLine is easier to deploy and manage, while ModSecurity offers more granular rule control and has a larger ecosystem of existing rules and tools.
Is SafeLine suitable for production use?
Yes. SafeLine is used in production by many organizations, particularly in Asia-Pacific markets. The community edition is feature-complete and regularly updated. For mission-critical deployments, consider the Pro edition for clustering support and priority assistance from Chaitin Tech.
Does SafeLine work with Kubernetes?
SafeLine can run in Docker on a Kubernetes node, but it does not have a native Kubernetes Ingress Controller integration. For Kubernetes-native WAF, consider Coraza (with ingress controller plugins) or a cloud-native WAF service. SafeLine is best suited for standalone Docker deployments or VM-based infrastructure.
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