{"id":"CVE-2023-47124","state":"PUBLISHED","title":"Denial of service whith ACME HTTPChallenge in Traefik","description":"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`.","publishedAt":"2023-12-04T20:20:30.727Z","updatedAt":"2024-12-18T14:12:58.629Z","severity":{"score":5.9,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","source":"GitHub_M"},"assigner":"GitHub_M","products":["traefik traefik"],"affected":[{"vendor":"traefik","product":"traefik","versions":[{"version":"< 2.10.6","status":"affected"},{"version":">= 3.0.0-beta1, < 3.0.0-beta5","status":"affected"}]}],"references":["https://github.com/traefik/traefik/security/advisories/GHSA-8g85-whqh-cr2f","https://doc.traefik.io/traefik/https/acme/#dnschallenge","https://doc.traefik.io/traefik/https/acme/#httpchallenge","https://doc.traefik.io/traefik/https/acme/#tlschallenge","https://github.com/traefik/traefik/releases/tag/v2.10.6","https://github.com/traefik/traefik/releases/tag/v3.0.0-beta5","https://www.cloudflare.com/learning/ddos/ddos-attack-tools/slowloris"],"weaknesses":["CWE-772"],"ingestedAt":"2026-10-29T20:06:24.729Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2023/47xxx/CVE-2023-47124.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2023-47124","state":"PUBLISHED","datePublished":"2023-12-04T20:20:30.727Z","dateUpdated":"2024-12-18T14:12:58.629Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2023-10-30T19:57:51.676Z"},"containers":{"cna":{"title":"Denial of service whith ACME HTTPChallenge in Traefik","descriptions":[{"lang":"en","value":"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. 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