CVE-2024-39321

Name: CVE-2024-39321
Creator: NVD / NIST
Published: 2024-07-05T18:15:32.43+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.59%

Last modified Jun 17, 2026

CVE-2024-39321 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. EPSS estimates a 0.59% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

EPSS Probability

0.59%

43.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-639

Affected Software

Vendor	Product	Versions
Traefik	Traefik	< 2.11.6
Traefik	Traefik	>= 3.0.0, < 3.0.4
Traefik	Traefik	3.1.0

References

https://github.com/traefik/traefik/releases/tag/v2.11.6Release Notes
https://github.com/traefik/traefik/releases/tag/v3.0.4Release Notes
https://github.com/traefik/traefik/releases/tag/v3.1.0-rc3Release Notes
https://github.com/traefik/traefik/security/advisories/GHSA-gxrv-wf35-62w9Patch, Vendor Advisory
https://github.com/traefik/traefik/releases/tag/v2.11.6Release Notes
https://github.com/traefik/traefik/releases/tag/v3.0.4Release Notes
https://github.com/traefik/traefik/releases/tag/v3.1.0-rc3Release Notes
https://github.com/traefik/traefik/security/advisories/GHSA-gxrv-wf35-62w9Patch, Vendor Advisory

Timeline

Published: Jul 5, 2024
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2024-39321?

How severe is CVE-2024-39321?

CVE-2024-39321 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.59% probability of exploitation in the next 30 days.

How do I fix CVE-2024-39321?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2024-39321?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST