CVE-2021-21321 is a critical vulnerability affecting the fastify-reply-from npm package, a fastify plugin for HTTP request forwarding. It allows an attacker to bypass intended prefix restrictions and access unauthorized backend services by crafting a specific URL. With a CVSS score of 10.0, this vulnerability is easily exploitable over the network with low complexity, potentially leading to complete compromise of confidentiality, integrity, and availability. While no active exploitation, public exploit code, or significant community discussion has been observed, the high severity warrants immediate patching to version 4.0.2 or later.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 4.0.2CPE matchmatch criteria | cpe:2.3:a:fastify-reply-from_project:fastify-reply-from:*:*:*:*:*:node.js:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.