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CVE-2024-39321— Traefik vulnerable to bypassing IP allow-lists via HTTP/3 early data requests in QUIC 0-RTT handshakes

Quick assessment

Affected
traefik traefik
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Containous Traefik是一款开源的反向代理与负载均衡工具。 Containous Traefik 2.11.6、3.0.4、3.1.0-rc3 之前版本存在安全漏洞，该漏洞源于允许通过伪造IP地址发送的QUIC 0-RTT握手中的HTTP/3早期数据请求绕过IP允许列表。

CVSS 7.5 · High EPSS 0.59% · P47
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I. Basic Information for CVE-2024-39321

Vulnerability Information
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Vulnerability Title
Traefik vulnerable to bypassing IP allow-lists via HTTP/3 early data requests in QUIC 0-RTT handshakes
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5
Vulnerability Title
Containous Traefik 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Containous Traefik是一款开源的反向代理与负载均衡工具。 Containous Traefik 2.11.6、3.0.4、3.1.0-rc3 之前版本存在安全漏洞，该漏洞源于允许通过伪造IP地址发送的QUIC 0-RTT握手中的HTTP/3早期数据请求绕过IP允许列表。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
traefik traefik < 2.11.6 -

II. Public POCs for CVE-2024-39321

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Qwen3.6-35B-A3B · 8905 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2024-39321

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Vendor Advisories for CVE-2024-39321 (1)

Other References for CVE-2024-39321 (3)

IV. Related Vulnerabilities

Same product: traefik
Same vendor: traefik
Same weakness: CWE-639

V. Comments for CVE-2024-39321

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