CVE-2025-23221CWE-835CWE-918

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

Medium · published January 20, 2025

CVSS v3.1
5.4
EPSS
1%
Percentile
47.6
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.4 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:L
CVSS v4.0
Not supplied
EPSS
0.00593 · 47.6th percentile
Weaknesses
CWE-835 · Loop with Unreachable Exit Condition ('Infinite Loop'); CWE-918 · Server-Side Request Forgery (SSRF)
Published
2025-01-20T16:49Z
EPSS history
Timeline
  • 20 JAN 16:49Z
    Fedify has an Infinite loop and Blind SSRF found inside the Webfinger mechanism
    cvelistv5