CVE-2025-66415
December 01, 2025
fastify-reply-from is a Fastify plugin to forward the current HTTP request to another server. Prior to 12.5.0, by crafting a malicious URL, an attacker could access routes that are not allowed, even though the reply.from is defined for specific routes in @fastify/reply-from. This vulnerability is fixed in 12.5.0.
Affected Packages
https://github.com/fastify/fastify-reply-from.git (GITHUB):
Affected version(s) >=v0.1.0 <v12.5.0Fix Suggestion:
Update to version v12.5.0@fastify/reply-from (NPM):
Affected version(s) >=7.0.0 <12.5.0Fix Suggestion:
Update to version 12.5.0Related Resources (4)
Do you need more information?
Contact UsCVSS v4
Base Score:
6.9
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
LOW
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
6.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Weakness Type (CWE)
Unintended Proxy or Intermediary ('Confused Deputy')
EPSS
Base Score:
0.04
