CVE-2023-47124
Denial of service whith ACME HTTPChallenge in Traefik
- Published
- Updated
- Reserved
- Assigned by
- GitHub_M
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`.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 3.1 | Medium5.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVDNVD · Modified | 3.1 | Medium5.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.79% · top 43% of all CVEs (7 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.9.
Weakness
Affected products
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- Gogithub.com/traefik/traefik/v2GHSA-8g85-whqh-cr2f (opens in a new tab)
- Gogithub.com/traefik/traefik/v3GHSA-8g85-whqh-cr2f (opens in a new tab)
References (7)
- https://github.com/traefik/traefik/security/advisories/GHSA-8g85-whqh-cr2f (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://doc.traefik.io/traefik/https/acme/#dnschallenge (opens in a new tab)x_refsource_MISCx_transferred
- https://doc.traefik.io/traefik/https/acme/#httpchallenge (opens in a new tab)x_refsource_MISCx_transferred
- https://doc.traefik.io/traefik/https/acme/#tlschallenge (opens in a new tab)x_refsource_MISCx_transferred
- https://github.com/traefik/traefik/releases/tag/v2.10.6 (opens in a new tab)x_refsource_MISCx_transferred
- https://github.com/traefik/traefik/releases/tag/v3.0.0-beta5 (opens in a new tab)x_refsource_MISCx_transferred
- https://www.cloudflare.com/learning/ddos/ddos-attack-tools/slowloris (opens in a new tab)x_refsource_MISC
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-8g85-whqh-cr2f (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2023-47124)Record last updated .