CVE-2025-23221

Fedify has an Infinite loop and Blind SSRF found inside the Webfinger mechanism

CVSS 5.4 MEDIUMEPSS 0.6%CWE-835 CWE-918

Vexday Risk Score

13Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 5.4EPSS 0.6%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

20 Jan 2025Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:L

Affected products

dahlia · fedify

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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