CVE-2023-51701

Name: CVE-2023-51701
Creator: NVD / NIST
Published: 2024-01-08T14:15:46.677+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.48%

Last modified Jun 17, 2026

CVE-2023-51701 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. fastify-reply-from is a Fastify plugin to forward the current HTTP request to another server. A reverse proxy server built with `@fastify/reply-from` could misinterpret the incoming body by passing an header `ContentType: application/json ; charset=utf-8`. EPSS estimates a 0.48% chance of exploitation in the next 30 days.

Description

fastify-reply-from is a Fastify plugin to forward the current HTTP request to another server. A reverse proxy server built with `@fastify/reply-from` could misinterpret the incoming body by passing an header `ContentType: application/json ; charset=utf-8`. This can lead to bypass of security checks. This vulnerability has been patched in '@fastify/reply-from` version 9.6.0.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

0.48%

37.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Fastify	Reply-From	< 9.6.0

References

https://github.com/fastify/fastify-reply-from/releases/tag/v9.6.0Release Notes
https://github.com/fastify/fastify-reply-from/security/advisories/GHSA-v2v2-hph8-q5xpVendor Advisory
https://github.com/fastify/fastify-reply-from/releases/tag/v9.6.0Release Notes
https://github.com/fastify/fastify-reply-from/security/advisories/GHSA-v2v2-hph8-q5xpVendor Advisory

Timeline

Published: Jan 8, 2024
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-51701?

How severe is CVE-2023-51701?

CVE-2023-51701 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.48% probability of exploitation in the next 30 days.

How do I fix CVE-2023-51701?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-51701?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST