CrowdSec Pairs With Traefik to Block Web App Attacks Using Shared Threat Data

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CrowdSec is an open-source intrusion prevention tool that complements Fail2ban by targeting HTTP-layer threats rather than SSH, working alongside the Traefik reverse proxy. It reads Traefik access logs to detect suspicious behavior such as port scans, path probing, CVE exploitation attempts, and login brute force attacks. A Traefik plugin called a bouncer enforces bans by returning a 403 Forbidden response to flagged IPs across all protected applications. CrowdSec also participates in a collaborative community blocklist, where anonymized attack data is shared globally so users benefit from threats detected elsewhere. The setup, tested with CrowdSec v1.8.1 and Traefik v3.7, requires Docker Compose and JSON-formatted access logging enabled in Traefik.

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