CVE-2023-47124: Traefik

Medium severity, CVSS 5.9. EPSS: 0.8% chance of exploitation in the next 30 days.

Traefik is an open source HTTP reverse proxy and load balancer. When Traefik is configured to use the `HTTPChallenge` to generate and renew the Let's Encrypt TLS certificates, the delay authorized to solve the challenge (50 seconds) can be exploited by attackers to achieve a `slowloris attack`. This vulnerability has been patch in version 2.10.6 and 3.0.0-beta5. Users are advised to upgrade. Users unable to upgrade should replace the `HTTPChallenge` with the `TLSChallenge` or the `DNSChallenge`.

Affected products

• Traefik Traefik: up to and including 2.10.5; version 3.0.0 only

Published 2023-12-04. Last modified 2026-06-17.