{"id":"CVE-2023-47124","summary":"Denial of service whith ACME HTTPChallenge in Traefik","details":"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`.","aliases":["GHSA-8g85-whqh-cr2f","GO-2023-2381"],"modified":"2026-04-14T03:47:33.900324Z","published":"2023-12-04T20:20:30.727Z","related":["CGA-96jx-28rp-cv2f","openSUSE-SU-2024:13506-1","openSUSE-SU-2024:14076-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/47xxx/CVE-2023-47124.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-772"]},"references":[{"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":"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"},{"type":"WEB","url":"ttps://www.cloudflare.com/learning/ddos/ddos-attack-tools/slowloris/"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/47xxx/CVE-2023-47124.json"},{"type":"ADVISORY","url":"https://github.com/traefik/traefik/security/advisories/GHSA-8g85-whqh-cr2f"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-47124"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/traefik/traefik","events":[{"introduced":"519ed8bde58e9ebc6d9618a38a351208820cf273"},{"fixed":"b2bb96390a1f7cf8bcc67838c6cf1cf2638f6113"}]}],"versions":["v3.0.0-beta1","v3.0.0-beta2","v3.0.0-beta3","v3.0.0-beta4"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2023-47124.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}