{"schema_version":"1.7.3","id":"GHSA-8g85-whqh-cr2f","published":"2023-12-05T18:12:37Z","modified":"2026-08-07T08:12:05.047629586Z","aliases":["CVE-2023-47124","GO-2023-2381"],"summary":"Traefik vulnerable to potential DDoS via ACME HTTPChallenge","details":"## Impact\n\nThere is a potential vulnerability in Traefik managing the ACME HTTP challenge.\n\nWhen Traefik is configured to use the [HTTPChallenge](https://doc.traefik.io/traefik/https/acme/#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 ([slowloris attack](https://www.cloudflare.com/learning/ddos/ddos-attack-tools/slowloris/)).\n \n## Patches\n\n- https://github.com/traefik/traefik/releases/tag/v2.10.6\n- https://github.com/traefik/traefik/releases/tag/v3.0.0-beta5\n\n## Workarounds\n\nReplace the HTTPChallenge with the [TLSChallenge](https://doc.traefik.io/traefik/https/acme/#tlschallenge) or the [DNSChallenge](https://doc.traefik.io/traefik/https/acme/#dnschallenge).\n\n## For more information\n\nIf you have any questions or comments about this advisory, please [open an issue](https://github.com/traefik/traefik/issues).","affected":[{"package":{"name":"github.com/traefik/traefik/v2","ecosystem":"Go","purl":"pkg:golang/github.com/traefik/traefik/v2"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2.10.6"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2023/12/GHSA-8g85-whqh-cr2f/GHSA-8g85-whqh-cr2f.json"}},{"package":{"name":"github.com/traefik/traefik/v3","ecosystem":"Go","purl":"pkg:golang/github.com/traefik/traefik/v3"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"3.0.0-beta5"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2023/12/GHSA-8g85-whqh-cr2f/GHSA-8g85-whqh-cr2f.json"}}],"references":[{"type":"WEB","url":"https://github.com/traefik/traefik/security/advisories/GHSA-8g85-whqh-cr2f"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-47124"},{"type":"WEB","url":"https://doc.traefik.io/traefik/https/acme/#dnschallenge"},{"type":"WEB","url":"https://doc.traefik.io/traefik/https/acme/#httpchallenge"},{"type":"WEB","url":"https://doc.traefik.io/traefik/https/acme/#tlschallenge"},{"type":"PACKAGE","url":"https://github.com/traefik/traefik"},{"type":"WEB","url":"https://github.com/traefik/traefik/releases/tag/v2.10.6"},{"type":"WEB","url":"https://github.com/traefik/traefik/releases/tag/v3.0.0-beta5"},{"type":"WEB","url":"https://www.cloudflare.com/learning/ddos/ddos-attack-tools/slowloris"}],"database_specific":{"cwe_ids":["CWE-400","CWE-772"],"github_reviewed":true,"github_reviewed_at":"2023-12-05T18:12:37Z","nvd_published_at":"2023-12-04T21:15:33Z","severity":"MODERATE"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}