SSRF in Dahlia Fedify
CVE-2025-23221
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.
EPSS: 0.006 (44.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:L.
Affected products
- Dahlia Fedify — versions < 1.0.14, >= 1.1.0, < 1.1.11, >= 1.2.0, < 1.2.11
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
Frequently asked questions
- What is CVE-2025-23221?
- CVE-2025-23221 is a medium-severity vulnerability in Dahlia Fedify, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 5.4/10. Published 2025-01-20.
- How severe is CVE-2025-23221?
- Medium severity. CVSS v3 base score is 5.4 out of 10.