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    CVE-2025-66415

    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.

    Published:Dec 1, 2025
    Last Modified:Feb 6, 2026
    EPS:Dec 1, 2025
    EPSS Score:0.00059
    CVSS Score:5.4

    Affected Products

    Vendor
    Fastify
    Product
    Reply-from

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-219 XML Routing Detour Attacks
    CAPEC-465 Transparent Proxy Abuse

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High