#VU111268 Security features bypass in Apache Traffic Server - CVE-2025-31698

Vulnerability identifier: #VU111268

Vulnerability risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2025-31698

CWE-ID: CWE-254

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Apache Traffic Server
Server applications / Web servers

Vendor: Apache Foundation

Description

The vulnerability allows a remote attacker to bypass implemented IP-based ACLs.

The vulnerability exists due to application does not apply IP-based ACL on requests sent with PROXY HTTP method. A remote attacker can bypass implemented filtration and gain unauthorized access to the application. 

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Apache Traffic Server: 9.0.0, 9.0.1, 9.0.2, 9.1.0, 9.1.1, 9.1.2, 9.1.3, 9.1.4, 9.2.0, 9.2.1, 9.2.2, 9.2.3, 9.2.4, 9.2.5, 9.2.6, 9.2.7, 9.2.8, 9.2.9, 9.2.10, 10.0.0, 10.0.1, 10.0.2, 10.0.3, 10.0.4, 10.0.5

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External links
https://lists.apache.org/thread/5xl7j37vnb04c4jmdmwctvqx1pnqxf4g
https://lists.apache.org/thread/lc3jb0wqx4wptgt3r6gdpgpbk0k3cv3p

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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.