---
id: CVE-2025-61581
title: >-
  ** 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 R…
summary: >-
  ** 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 R…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-1333
vendor: apache
product: traffic_control
affected:
  - traffic_control <= 8.0.2
published: '2025-10-16'
updated: '2026-10-09'
sourceUpdated: '2026-10-09T10:10:00.193'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-61581'
references:
  - url: 'https://lists.apache.org/thread/mx2jxgnlop2f4vbqnvmrldh4pqmobxvp'
    label: security@apache.org
  - url: 'http://www.openwall.com/lists/oss-security/2025/10/16/3'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.00736
epssPercentile: 0.53077
ingestedAt: '2026-10-09T12:53:28.941Z'
---

## Overview

** 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.

## Affected

- `traffic_control <= 8.0.2`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.