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Vulnerability · Published Jan 20, 2025 · Assigned by GitHub_M

CVE-2025-23221Fedify has an Infinite loop and Blind SSRF found inside the Webfinger mechanism

Medium 5.4

In plain English

A medium-severity infinite loop in fedify from dahlia. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 50% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.4Medium
Exploit odds (30 days)0.6%top 50.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
npm@fedify/fedify1.0.14GHSA-c59p-wq67-24wx
npm@fedify/fedify1.1.11GHSA-c59p-wq67-24wx
npm@fedify/fedify1.2.11GHSA-c59p-wq67-24wx
npm@fedify/fedify1.3.4GHSA-c59p-wq67-24wx

Affected products (as reported)

VendorProductVersions
dahlia fedify < 1.0.14>= 1.1.0, < 1.1.11>= 1.2.0, < 1.2.11>= 1.3.0, < 1.3.4

Weakness: CWE-835, CWE-918 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:L

References