{"cve":"CVE-2023-47124","nvd":{"published":"2023-12-04T21:15:33.850","modified":"2026-06-17T06:32:12.267","status":"Modified","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`.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","score":5.9},"cwes":["CWE-772"],"references":["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"],"products":["traefik:traefik"],"source":"nvd","synced_at":"2026-10-19T21:42:34.585441961+00:00"},"epss":{"cve":"CVE-2023-47124","score":0.00791,"percentile":0.56301,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-8g85-whqh-cr2f","url":"https://osv.dev/vulnerability/GHSA-8g85-whqh-cr2f","summary":"Traefik vulnerable to potential DDoS via ACME HTTPChallenge","modified":"2026-08-07T08:12:05.047629586Z","packages":[{"ecosystem":"Go","name":"github.com/traefik/traefik/v2","purl":"pkg:golang/github.com/traefik/traefik/v2","ranges":["<2.10.6"],"fixed":["2.10.6"]},{"ecosystem":"Go","name":"github.com/traefik/traefik/v3","purl":"pkg:golang/github.com/traefik/traefik/v3","ranges":["<3.0.0-beta5"],"fixed":["3.0.0-beta5"]}]},{"id":"GO-2023-2381","url":"https://osv.dev/vulnerability/GO-2023-2381","summary":"Traefik vulnerable to potential DDoS via ACME HTTPChallenge in github.com/traefik/traefik","modified":"2026-08-07T08:12:20.828843339Z","packages":[{"ecosystem":"Go","name":"github.com/traefik/traefik","purl":"pkg:golang/github.com/traefik/traefik","ranges":["all versions"],"fixed":[]},{"ecosystem":"Go","name":"github.com/traefik/traefik/v2","purl":"pkg:golang/github.com/traefik/traefik/v2","ranges":["<2.10.6"],"fixed":["2.10.6"]},{"ecosystem":"Go","name":"github.com/traefik/traefik/v3","purl":"pkg:golang/github.com/traefik/traefik/v3","ranges":["<3.0.0-beta5"],"fixed":["3.0.0-beta5"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}