Vulnerability in Traefik
CVE-2023-47124
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`.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.008 (54.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 54.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000
Affected products
- Traefik — versions 3.0.0, >= 3.0.0-beta1, < 3.0.0-beta5, < 2.10.6
Weakness classification (CWE)
References
- github.com/traefik/traefik/security/advisories/GHSA-8g85-whqh-cr2f (Third Party Advisory)
- doc.traefik.io/traefik/https/acme/ (Product)
- doc.traefik.io/traefik/https/acme/ (Product)
- doc.traefik.io/traefik/https/acme/ (Product)
- github.com/traefik/traefik/releases/tag/v2.10.6 (Release Notes)
- github.com/traefik/traefik/releases/tag/v3.0.0-beta5 (Release Notes)
- www.cloudflare.com/learning/ddos/ddos-attack-tools/slowloris
Frequently asked questions
- What is CVE-2023-47124?
- CVE-2023-47124 is a medium-severity vulnerability in Traefik, classified under Missing Release of Resource after Effective Lifetime. CVSS score: 5.9/10. Published 2023-12-04.
- How severe is CVE-2023-47124?
- Medium severity. CVSS v3 base score is 5.9 out of 10.