High severity · published Jul 5, 2024
CVE-2024-39321
Traefik vulnerable to bypassing IP allow-lists via HTTP/3 early data requests in QUIC 0-RTT handshakes
7.5
CVSS
0.6%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 48% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
TR
traefik · traefik
< 2.11.6; >= 3.0.0-beta3, < 3.0.4; >= 3.1.0-rc1, < 3.1.0-rc3 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2024-39321
CVE.org
https://www.cve.org/CVERecord?id=CVE-2024-39321
Release Notes
https://github.com/traefik/traefik/releases/tag/v2.11.6
Release Notes
https://github.com/traefik/traefik/releases/tag/v3.0.4
Release Notes
https://github.com/traefik/traefik/releases/tag/v3.1.0-rc3
Patch
https://github.com/traefik/traefik/security/advisories/GHSA-gxrv-wf35-62w9
More from traefik
10.0
CVE-2026-54763
Traefik: headerField underscore-variant identity spoofing in BasicAuth / DigestAuth / ForwardAuth
10.0
CVE-2026-53622
Traefik: HTTP/3 mTLS bypass via exact SNI TLSOptions lookup for wildcard and mixed-case hosts
10.0
CVE-2026-48491
Traefik: SNICheck ignores wildcard TLSOptions mappings, allowing domain-fronted mTLS bypass
10.0
CVE-2026-48020
Traefik StripPrefix Route-Level Auth Bypass via Path Normalization
10.0
CVE-2026-39858
Traefik: Forwarded alias spoofing top pre-auth decision bypass