Crowdsec Has a Free Open-Source Security Engine

CrowdSec is a free, open-source security engine that detects and blocks malicious behavior using crowd-sourced threat intelligence.

What Is CrowdSec?

CrowdSec analyzes your logs, detects attacks, and shares threat intelligence with the community. Think of it as a collaborative fail2ban on steroids.

Key features:

• Log analysis and threat detection
• Community-driven IP blocklists
• Multi-service: SSH, HTTP, WordPress, etc.
• Bouncers (block at firewall, Nginx, Traefik, CloudFlare)
• Dashboard (CrowdSec Console)
• REST API
• Low resource usage
• 100+ pre-built scenarios

Quick Start

curl -s https://install.crowdsec.net | sudo sh
sudo apt install crowdsec
sudo apt install crowdsec-firewall-bouncer-iptables

CrowdSec immediately starts analyzing your logs and blocking bad IPs.

How It Works

1. Detect: CrowdSec parses logs (Nginx, SSH, WordPress, etc.)
2. Decide: Compares behavior against scenarios (brute force, scanning, etc.)
3. Block: Sends decisions to bouncers (firewall, Nginx, etc.)
4. Share: Shares malicious IPs with the community
5. Receive: Gets community blocklist (1M+ IPs)

Supported Services

• Web: Nginx, Apache, Traefik, Caddy, HAProxy
• CMS: WordPress, Magento, PrestaShop
• SSH: OpenSSH
• Mail: Postfix, Dovecot
• Cloud: CloudFlare, AWS WAF
• Firewall: iptables, nftables, pf
• Custom: Any log format

CrowdSec vs fail2ban

Feature	fail2ban	CrowdSec
Detection	Regex	Scenarios
Sharing	No	Community
Blocklist	Local only	1M+ community IPs
Performance	Single-threaded	Multi-threaded
Dashboard	No	Yes (free)
API	No	Yes
Multi-server	No	Yes

With 9K+ GitHub stars. Security powered by the crowd.

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