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)
EPSS: 0.006 (44.9th percentile) — read the EPSS interpretation.
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.
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
- security-advisories@github.com (x_refsource_CONFIRM, Patch, Vendor Advisory)
- security-advisories@github.com (x_refsource_MISC, Release Notes)
- security-advisories@github.com (x_refsource_MISC, Release Notes)
- security-advisories@github.com (x_refsource_MISC, 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.