CVE-2025-23221
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…
Does this matter?
Lower severity and a low EPSS score (0.59%). Track it; it rarely justifies an emergency change on its own.
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 3.1
- 5.4 MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:L
- EPSS
- 0.59% probability · 47th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-835, CWE-918
- Source
- security-advisories@github.com
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
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.