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Fencer Intel
high 7.5

CVE-2024-39321 json

Traefik vulnerable to bypassing IP allow-lists via HTTP/3 early data requests in QUIC 0-RTT handshakes

published 2y ago modified 2mo ago also EUVD-2024-2353 , GHSA-gxrv-wf35-62w9 , GO-2024-2973

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 48%
public exploits
0
none known

Summary

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.

Patch / fix

  • go github.com/traefik/traefik/v2 2.11.6
  • go github.com/traefik/traefik/v3 3.0.4, 3.1.0-rc3
  • traefik traefik 2.11.6, 3.0.4, 3.1.0-rc3
  • traefik openSUSE Tumbleweed 3.0.4-2.1
  • traefik2 openSUSE Tumbleweed 2.11.6-2.1

opensuse advisories openSUSE-SU-2024:14181-1openSUSE-SU-2024:14182-1

Is CVE-2024-39321 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2024-39321 updated cvss 7.5

traefik: Bypassing IP allow-lists via HTTP/3 early data requests in QUIC 0-RTT handshakes

  • Red Hat OpenShift Dev Spaces devspaces/devspaces-rhel8-operator Red Hat OpenShift GitOps openshift-gitops-1/argo-rollouts-rhel8
    affected: workaround, no fix available
  • Red Hat OpenShift Dev Spaces (RHOSDS) 3.23 devspaces 3.23-1756504388
    fixed: vendor fix RHSA-2025:15847
  • Red Hat OpenShift Dev Spaces (RHOSDS) 3.23 devspaces 3.23-1756506343, devspaces 3.23-1756507311, devspaces 3.23-1756509551, devspaces 3.23-1756753588, devspaces 3.23-1756828766, devspaces 3.23-1757017659, +8 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2y ago

Exploit prediction

0.59% chance of exploitation in the next 30 days, higher than 48% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected packages

ecosystem package affected fixed in
go github.com/traefik/traefik/v2
<2.11.6
2.11.6
go github.com/traefik/traefik/v3
>=3.0.0-beta3, <3.0.4
>=3.1.0-rc1, <3.1.0-rc3
3.0.4
3.1.0-rc3
go github.com/traefik/traefik
all versions
 no fix listed

Affected products

  • traefik traefik

Classification

Weakness
  • CWE-639 Authorization Bypass Through User-Controlled Key

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.