CVE-2023-47633 Uncontrolled Resource Consumption in Traefik
Traefik consumes 100% CPU when serving as its own backend in default Docker configurations, causing denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-47633?
CVE-2023-47633 is a high-severity denial of service vulnerability in Traefik Traefik, published on 4 Dec 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Traefik is an open source HTTP reverse proxy and load balancer. The traefik docker container uses 100% CPU when it serves as its own backend, which is an automatically generated route resulting from the Docker integration in the default configuration. This issue has been addressed in versions 2.10.6 and 3.0.0-beta5. Users are advised to upgrade. There are no known workarounds for this vulnerability.
Weakness: CWE-400
Which versions are affected by CVE-2023-47633?
7 open source packages ship an affected version, including github.com/traefik/traefik/v2, github.com/traefik/traefik and github.com/traefik/traefik/v3. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
github.com/traefik/traefik/v2 Go | All versions | 2.10.6 |
github.com/traefik/traefik/v2 Go | All versions | 2.10.6 |
github.com/traefik/traefik/v2 Go | All versions | 2.10.6 |
github.com/traefik/traefik Go | All versions | None |
github.com/traefik/traefik/v3 Go | All versions | 3.0.0-beta5 |
github.com/traefik/traefik/v3 Go | All versions | 3.0.0-beta5 |
1 more packages
github.com/traefik/traefik/v3 Go | All versions | 3.0.0-beta5 |
Products include Traefik Traefik.
How do I fix CVE-2023-47633?
Upgrade github.com/traefik/traefik/v2 to 2.10.6 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2023-47633 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-47633 exists.
Other vulnerabilities in Traefik Traefik
- CVE-2024-45410 HTTP client can remove the X-Forwarded headers in Traefik
- CVE-2026-88877 Traefik v3.7.0 Authentication Bypass via from-to-www-redirect
- CVE-2026-85595 Traefik before v2.11.55 and v3.0.0 through v3.7.10 Authentication Bypass via digestAuth
- CVE-2026-88007 Traefik HTTP/3 Backend NTLM Connection Reuse
- CVE-2026-88009 Traefik: Rootless HTTP/1 request-target routes as "/" but is forwarded verbatim, bypassing path-scoped routing, middleware guards and access logging
Sources
Also known as ECHO-9ed8-ad9b-e410, GHSA-6fwg-jrfw-ff7p, GO-2023-2377.