CVE-2025-23221

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

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.

Category

5.4
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.16%
Affected: dahlia fedify
Published at:
Updated at:

References

Link Tags
https://github.com/dahlia/fedify/security/advisories/GHSA-c59p-wq67-24wx
https://github.com/dahlia/fedify/commit/8be3c2038eebf4ae12481683a1e809b314be3151
https://github.com/dahlia/fedify/commit/c505eb82fcd6b5b17174c6659c29721bc801ab9a
https://github.com/dahlia/fedify/commit/e921134dd5097586e4563ea80b9e8d1b5460a645

Frequently Asked Questions

What is the severity of CVE-2025-23221?
CVE-2025-23221 has been scored as a medium severity vulnerability.
How to fix CVE-2025-23221?
To fix CVE-2025-23221, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-23221 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-23221 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-23221?
CVE-2025-23221 affects dahlia fedify.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.