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`.
Details
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected Packages
| Software | From version | Fixed in |
|---|---|---|
| github.com/traefik/traefik | — | — |
| github.com/traefik/traefik/v2 | — | — |
| github.com/traefik/traefik/v3 | — | — |
| traefik | — | — |
References
Similar Threats
- Medium CVE-2025-66490
- Medium CVE-2025-66491
- Critical CVE-2025-54386
- Critical CVE-2025-47952
- Critical CVE-2025-32431
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