CVE-2021-21321

    Dashboard / Vulnerabilities / CVE-2021-21321

    CVE-2021-21321

    Published: 2 Mar 2021Last Modified: 7 Aug 2026

    Summary:

    Details: fastify-reply-from is an npm package which is a fastify plugin to forward the current http request to another server. In fastify-reply-from before version 4.0.2, by crafting a specific URL, it is possible to escape the prefix of the proxied backend service. If the base url of the proxied server is "/pub/", a user expect that accessing "/priv" on the target service would not be possible. In affected versions, it is possible. This is fixed in version 4.0.2.

    References: https://github.com/fastify/fastify-reply-from/security/advisories/GHSA-qmw8-3v4g-gwj4, https://www.npmjs.com/package/fastify-reply-from, https://github.com/fastify/fastify-reply-from/commit/dea227dda606900cc01870d08541b4dcc69d3889

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -e158d9b1dec30ba130c4db7aedb047024f8dbeea

    Affected versions

    v4.0.0

    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
    CVE-2021-21321 | CVE-DB