Vulnerability 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.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/dahlia/fedify/commit/8be3c2038eebf4ae12481683a1e809b314be3151
- https://github.com/dahlia/fedify/commit/c505eb82fcd6b5b17174c6659c29721bc801ab9a
- https://github.com/dahlia/fedify/commit/e921134dd5097586e4563ea80b9e8d1b5460a645
- https://github.com/dahlia/fedify/security/advisories/GHSA-c59p-wq67-24wx
FAQ
What is CVE-2025-23221?
CVE-2025-23221 is a vulnerability with a CVSS score of 5.4 (MEDIUM). 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 requ...
How severe is CVE-2025-23221?
CVE-2025-23221 has been rated MEDIUM with a CVSS base score of 5.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-23221?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.