Vulnerability identifier: #VU93811

Vulnerability risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2024-39321

CWE-ID: CWE-254

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Traefik
Server applications / Other server solutions

Vendor: Containous

Description

The vulnerability allows a remote attacker to bypass implemented security restrictions.

The vulnerability exists due to improper input validation when handling HTTP/3 early data requests in QUIC 0-RTT handshakes. A remote attacker can spoof the original IP address and bypass IP allow-lists.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Traefik: 2.0.0 - 3.0.3

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External links
http://github.com/traefik/traefik/security/advisories/GHSA-gxrv-wf35-62w9
http://github.com/traefik/traefik/releases/tag/v2.11.6
http://github.com/traefik/traefik/releases/tag/v3.0.4

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.