CVE-2024-39321

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

HIGH

7.5

CVSS Score

Published: July 5, 2024 at 05:32 PM UTC

Updated: June 17, 2026 at 07:41 AM UTC

1 product affected across 1 vendorTraefik

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Severity

HIGH7.5

Exploit prediction

EPSS 0.6%

SSVC

No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Traefik · Traefik

95%

v < 2.11.6v < 3.0.4v < 3.1.0-rc33.0.0 ≤ v < 3.0.43.1.0 3.1.0 rc1 3.1.0 rc2

Affected range stops below 2.11.6, so it looks safe — our inference, not a vendor statement

Affected range stops below 3.0.4, so it looks safe — our inference, not a vendor statement

Affected range stops below 3.1.0-rc3, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://github.com/traefik/traefik/security/advisories/GHSA-gxrv-wf35-62w9

References (4)

x_refsource_MISCRelease Notes

Source: [email protected]

https://github.com/traefik/traefik/releases/tag/v2.11.6

x_refsource_MISCRelease Notes

Source: [email protected]

https://github.com/traefik/traefik/releases/tag/v3.0.4

x_refsource_MISCRelease Notes

Source: [email protected]

https://github.com/traefik/traefik/releases/tag/v3.1.0-rc3

x_refsource_CONFIRMPatchVendor Advisory

Source: [email protected]

https://github.com/traefik/traefik/security/advisories/GHSA-gxrv-wf35-62w9

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHGitHub_M

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: NONE
Integrity: HIGH
Availability: NONE

Vector?

Quick Info

StatusANALYZED

CWE

CWE-639

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