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CVE-2025-23221

5.4 · MEDIUM

Fedify is a TypeScript library for building federated server apps powered by ActivityPub and other standards.

Published Jan 20, 2025CWE-835EPSS 0.59%

Overview

CVE-2025-23221 is a medium-severity vulnerability. It was published on January 20, 2025 and has a CVSS 3.1 base score of 5.4 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.4, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Fedify is a TypeScript library for building federated server apps powered by ActivityPub and other standards. This vulnerability allows a user to maneuver the Webfinger mechanism to perform a GET request to any internal resource on any Host, Port, URL combination regardless of present security mechanisms, and forcing the victim’s server into an infinite loop causing Denial of Service. Moreover, this issue can also be maneuvered into performing a Blind SSRF attack. This vulnerability is fixed in 1.0.14, 1.1.11, 1.2.11, and 1.3.4.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/dahlia/fedify/commit/8be3c2038eebf4ae12481683a1e809b314be3151GitHubgithub.com/dahlia/fedify/commit/c505eb82fcd6b5b17174c6659c29721bc801ab9aGitHubgithub.com/dahlia/fedify/commit/e921134dd5097586e4563ea80b9e8d1b5460a645GitHubgithub.com/dahlia/fedify/security/advisories/GHSA-c59p-wq67-24wx

How CyberStrike helps

Frequently asked questions

What is CVE-2025-23221?

CVE-2025-23221 is a medium-severity vulnerability. It was published on January 20, 2025 and has a CVSS 3.1 base score of 5.4 (MEDIUM).

How severe is CVE-2025-23221?

This vulnerability has a CVSS 3.1 base score of 5.4, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2025-23221?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-23221?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-23221 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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