Vulnerability in Apache Traffic Control
CVE-2025-61581
** UNSUPPORTED WHEN ASSIGNED ** Inefficient Regular Expression Complexity vulnerability in Apache Traffic Control. This issue affects Apache Traffic Control: all versions. People with access to the management interface of the Traffic Router component could specify malicious patterns and cause unavailability. As this project is retired, we do not plan to release a version that fixes this issue. Users are recommended to find an alternative or restrict access to the instance to trusted users. NOTE: This vulnerability only affects products that are no longer supported by the maintainer.
Vulnerability class: ReDoS (Regular Expression Denial of Service)
EPSS: 0.007 (49.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
Weakness classification (CWE)
References
- security@apache.org (vendor-advisory, Mailing List, Vendor Advisory)
- af854a3a-2127-422b-91ae-364da2661108
Frequently asked questions
- What is CVE-2025-61581?
- CVE-2025-61581 is a high-severity vulnerability in Apache Traffic Control, classified under Inefficient Regular Expression Complexity. CVSS score: 7.5/10. Published 2025-10-16.
- How severe is CVE-2025-61581?
- High severity. CVSS v3 base score is 7.5 out of 10.