Auth bypass in Traefik
CVE-2024-39321
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.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.006 (46.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 46th percentile — 46.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
- Traefik — versions >= 3.1.0-rc1, < 3.1.0-rc3, < 2.11.6, 3.1.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/traefik/traefik/security/advisories/GHSA-gxrv-wf35-62w9 (Patch, Vendor Advisory)
- github.com/traefik/traefik/releases/tag/v2.11.6 (Release Notes)
- github.com/traefik/traefik/releases/tag/v3.0.4 (Release Notes)
- github.com/traefik/traefik/releases/tag/v3.1.0-rc3 (Release Notes)
Frequently asked questions
- What is CVE-2024-39321?
- CVE-2024-39321 is a high-severity vulnerability in Traefik, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 7.5/10. Published 2024-07-05.
- How severe is CVE-2024-39321?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2024-39321 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.