CVE-2024-39321 Traefik vulnerable to bypassing IP allow-lists via HTTP/3 early data requests in QUIC 0-RTT handshakes
Attackers can bypass IP allow-lists in Traefik by sending spoofed HTTP/3 early data requests, requiring an upgrade to patched versions.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2024-39321?
CVE-2024-39321 is a high-severity vulnerability in Traefik Traefik, published on 5 Jul 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Traefik is an HTTP reverse proxy and load balancer. Versions prior to 2.11.6, 3.0.4, and 3.1.0-rc3 have a vulnerability that allows bypassing IP allow-lists via HTTP/3 early data requests in QUIC 0-RTT handshakes sent with spoofed IP addresses. Versions 2.11.6, 3.0.4, and 3.1.0-rc3 contain a patch for this issue. No known workarounds are available.
Weakness: CWE-639
Which versions are affected by CVE-2024-39321?
9 open source packages ship an affected version, including github.com/traefik/traefik/v3, github.com/traefik/traefik and github.com/traefik/traefik/v2. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
github.com/traefik/traefik/v3 Go | From 3.0.0-beta3 | 3.0.4, 3.1.0-rc3 |
github.com/traefik/traefik/v3 Go | From 3.0.0-beta3 | 3.0.4 |
github.com/traefik/traefik/v3 Go | From 3.0.0-beta3 | 3.0.4 |
github.com/traefik/traefik/v3 Go | From 3.1.0-rc1 | 3.1.0-rc3 |
github.com/traefik/traefik/v3 Go | From 3.1.0-rc1 | 3.1.0-rc3 |
github.com/traefik/traefik Go | All versions | None |
3 more packages
github.com/traefik/traefik/v2 Go | All versions | 2.11.6 |
github.com/traefik/traefik/v2 Go | All versions | 2.11.6 |
github.com/traefik/traefik/v2 Go | All versions | 2.11.6 |
Linux distribution packages (2)
traefik openSUSE:Tumbleweed | All versions | 3.0.4-2.1 |
traefik2 openSUSE:Tumbleweed | All versions | 2.11.6-2.1 |
Products include Traefik Traefik.
How do I fix CVE-2024-39321?
Upgrade github.com/traefik/traefik/v3 to a fixed version for your release line: 3.0.4 or 3.1.0-rc3.
Is CVE-2024-39321 being exploited?
There is no known exploitation of CVE-2024-39321 in the wild and no public exploit code.
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-d285-70b0-fb21, GHSA-gxrv-wf35-62w9, GO-2024-2973, openSUSE-SU-2024:14181-1, openSUSE-SU-2024:14182-1.