CVE-2023-47124

Denial of service whith ACME HTTPChallenge in Traefik

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`.

Category

5.9
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.13%
Third-Party Advisory github.com
Affected: traefik traefik
Published at:
Updated at:

References

Link Tags
https://github.com/traefik/traefik/security/advisories/GHSA-8g85-whqh-cr2f third party advisory
https://doc.traefik.io/traefik/https/acme/#dnschallenge product
https://doc.traefik.io/traefik/https/acme/#httpchallenge product
https://doc.traefik.io/traefik/https/acme/#tlschallenge product
https://github.com/traefik/traefik/releases/tag/v2.10.6 release notes
https://github.com/traefik/traefik/releases/tag/v3.0.0-beta5 release notes
https://www.cloudflare.com/learning/ddos/ddos-attack-tools/slowloris
ttps://www.cloudflare.com/learning/ddos/ddos-attack-tools/slowloris/

Frequently Asked Questions

What is the severity of CVE-2023-47124?
CVE-2023-47124 has been scored as a medium severity vulnerability.
How to fix CVE-2023-47124?
To fix CVE-2023-47124, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2023-47124 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2023-47124 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2023-47124?
CVE-2023-47124 affects traefik traefik.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.