CrowdSec

CrowdSec is a collaborative open-source intrusion prevention system that detects and blocks malicious behavior using crowd-sourced threat intelligence from its global community of users. It analyzes server logs in real time using behavioral scenarios to identify attacks such as brute force attempts, port scans, web exploitation, and credential stuffing, then shares anonymized threat signals with the CrowdSec network. System administrators, DevOps teams, and security engineers deploy CrowdSec to protect servers and applications with an IPS that becomes more effective as more participants contribute threat data to the collective intelligence pool. Its modular architecture supports custom parsers and scenarios for any log format, and it integrates with firewalls, CDNs, and application middleware through its bouncer ecosystem to enforce blocking decisions at multiple network layers.