Apache Traffic Control Traffic Router redos

Summaryinfo

A vulnerability was found in Apache Traffic Control and classified as problematic. Affected by this issue is some unknown functionality of the component Traffic Router. Executing a manipulation can lead to redos. This vulnerability only affects products that are no longer supported by the maintainer. This vulnerability is registered as CVE-2025-61581. It is possible to launch the attack remotely. No exploit is available. It is recommended to use an alternative to replace the affected component.

Detailsinfo

A vulnerability classified as problematic was found in Apache Traffic Control (the affected version is unknown). This vulnerability affects an unknown code of the component Traffic Router. The manipulation with an unknown input leads to a redos vulnerability. The CWE definition for the vulnerability is CWE-1333. The product uses a regular expression with an inefficient, possibly exponential worst-case computational complexity that consumes excessive CPU cycles. As an impact it is known to affect availability. CVE summarizes:

** 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.

The weakness was published by Chris Lemmons. The advisory is shared for download at lists.apache.org. This vulnerability was named CVE-2025-61581 since 09/26/2025. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 10/16/2025). The MITRE ATT&CK project declares the attack technique as T1449.003.

The problem might be mitigated by replacing the product with as an alternative.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

• Apache

Name

• Traffic Control

License

• open-source

Support

• end of life

Website

• Vendor: https://www.apache.org/

CPE 2.3info

• 🔒

CPE 2.2info

• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Once again VulDB remains the best source for vulnerability data.

Discussion