CVE-2023-47124

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`.

• CWE-772

• https://doc.traefik.io/traefik/https/acme/#dnschallengeProduct
• https://doc.traefik.io/traefik/https/acme/#httpchallengeProduct
• https://doc.traefik.io/traefik/https/acme/#tlschallengeProduct
• https://github.com/traefik/traefik/releases/tag/v2.10.6Release Notes
• https://github.com/traefik/traefik/releases/tag/v3.0.0-beta5Release Notes
• https://github.com/traefik/traefik/security/advisories/GHSA-8g85-whqh-cr2fThird Party Advisory
• https://www.cloudflare.com/learning/ddos/ddos-attack-tools/slowloris
• https://doc.traefik.io/traefik/https/acme/#dnschallengeProduct
• https://doc.traefik.io/traefik/https/acme/#httpchallengeProduct
• https://doc.traefik.io/traefik/https/acme/#tlschallengeProduct
• https://github.com/traefik/traefik/releases/tag/v2.10.6Release Notes
• https://github.com/traefik/traefik/releases/tag/v3.0.0-beta5Release Notes
• https://github.com/traefik/traefik/security/advisories/GHSA-8g85-whqh-cr2fThird Party Advisory
• ttps://www.cloudflare.com/learning/ddos/ddos-attack-tools/slowloris/

Published

Dec 4, 2023

Last Modified

Jun 17, 2026

Status

Modified

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