CVE-2025-23221

Medium

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.

SeverityMedium

CVSS5.4

Exploit probability—

Product@fedify/fedify

PublishedJan 20, 2025

First seenJan 20, 2025

Weakness typeCWE-835CWE-835 CWE-918Server-side request forgery (SSRF)

How to fix

Update

@fedify/fedify1.0.14, 1.1.11, 1.2.11, 1.3.4 or later

Affected products

Product	Affected versions	Fixed in
@fedify/fedifynpm	1.0.13 ≤ v < 1.0.14, 1.1.10 ≤ v < 1.1.11, 1.2.10 ≤ v < 1.2.11, 1.3.3 ≤ v < 1.3.4	1.0.14, 1.1.11, 1.2.11, 1.3.4

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