CVE-2025-23221 - CVE House
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Status published Medium CVE-2025-23221

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

Vulnerability 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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

No credits recorded in the NVD database.

References

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CVE-2024-39687
Fedify vulnerable to allowing access to internal network resources
High 7.2

Affected Vendor

Affected Software

fedify
Vulnerable Versions:
< 1.0.14, >= 1.1.0, < 1.1.11, >= 1.2.0, < 1.2.11, >= 1.3.0, < 1.3.4

Timeline

Official Publish: January 20th, 2025
Last Modified: January 21st, 2025
Added to House: July 22nd, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:L

Weaknesses (CWE)

CWE-835 CWE-918

MITRE ATT&CK TTPs

T1499 Endpoint Denial of Service
Impact
T1190 Exploit Public-Facing Application
Initial Access
T1059 Command and Scripting Interpreter
Execution
T1562 Impair Defenses
Defense Evasion
T1485 Data Destruction
Impact
T1213 Data from Information Repositories
Collection
T1005 Data from Local System
Collection
T1046 Network Service Discovery
Discovery