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    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:Dec 4, 2023
    Last Modified:Dec 18, 2024
    EPS:Dec 4, 2023
    EPSS Score:0.00132
    CVSS Score:5.9

    Affected Products

    Vendor
    Traefik
    Product
    Traefik

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-469 HTTP DoS

    Related CVEs

    CVE-2026-88012 (CVSS 5.3) — Traefik is an open source HTTP reverse proxy and load balancer. From 2.8.2 until 2.11.56 and 3.7.12, HTTP/3 en…
    CVE-2026-88011 (CVSS 5.3) — Traefik is an open source HTTP reverse proxy and load balancer. Prior to 2.11.56, and from 3.0.0 until 3.7.12,…
    CVE-2026-88009 (CVSS 8.8) — Traefik is an open source HTTP reverse proxy and load balancer. Prior to 2.11.57, and 3.7.13, Traefik accepts …
    CVE-2026-88008 (CVSS 7) — Traefik is an open source HTTP reverse proxy and load balancer. From 2.11.26 until 2.11.57 and 3.7.13, Traefik…
    CVE-2026-88007 (CVSS 9.1) — Traefik is an open source HTTP reverse proxy and load balancer. From 2.11.0 until 2.11.57 and 3.7.13, the HTTP…
    CVE-2026-88004 (CVSS 7) — Traefik is an open source HTTP reverse proxy and load balancer. From 3.2.0 until 3.7.13, Traefik entrypoint de…
    CVE-2026-88879 (CVSS 5.3) — Traefik is an HTTP reverse proxy and load balancer. In Traefik v1.x, v2.x through v2.11.55, and v3.0.0 through…
    CVE-2026-88878 (CVSS 6.9) — Traefik is an HTTP reverse proxy and load balancer. In versions >= v2.8.2 through <= v2.11.55 and >= v3.0.0 th…
    CVE-2026-88877 (CVSS 9.3) — Traefik is a HTTP reverse proxy and load balancer. In versions >= v3.7.0 and <= v3.7.11, the Kubernetes ingres…
    CVE-2026-85596 (CVSS 8.2) — Traefik versions >= v3.7.0 and <= v3.7.10 contain an authentication bypass in the Kubernetes Ingress NGINX pro…

    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
    https://github.com/traefik/traefik/security/advisories/GHSA-8g85-whqh-cr2f
    https://www.cloudflare.com/learning/ddos/ddos-attack-tools/slowloris
    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
    https://github.com/traefik/traefik/security/advisories/GHSA-8g85-whqh-cr2f
    ttps://www.cloudflare.com/learning/ddos/ddos-attack-tools/slowloris/

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High