CVE-2021-37699

Name: CVE-2021-37699
Creator: NVD / NIST
Published: 2021-08-12T00:15:06.997+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 1.20%

Last modified Jun 17, 2026

CVE-2021-37699 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. Next.js is an open source website development framework to be used with the React library. In affected versions specially encoded paths could be used when pages/_error.js was statically generated allowing an open redirect to occur to an external site. EPSS estimates a 1.20% chance of exploitation in the next 30 days.

Description

Next.js is an open source website development framework to be used with the React library. In affected versions specially encoded paths could be used when pages/_error.js was statically generated allowing an open redirect to occur to an external site. In general, this redirect does not directly harm users although can allow for phishing attacks by redirecting to an attacker's domain from a trusted domain. We recommend everyone to upgrade regardless of whether you can reproduce the issue or not. The issue has been patched in release 11.1.0.

Metrics

CVSS 3.1

6.1/10

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

EPSS Probability

1.20%

64.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Vercel	Next.Js	>= 10.0.5, <= 10.2.0
Vercel	Next.Js	>= 11.0.0, <= 11.0.1

References

https://github.com/vercel/next.js/releases/tag/v11.1.0Release Notes, Third Party Advisory
https://github.com/vercel/next.js/security/advisories/GHSA-vxf5-wxwp-m7g9Third Party Advisory
https://github.com/vercel/next.js/releases/tag/v11.1.0Release Notes, Third Party Advisory
https://github.com/vercel/next.js/security/advisories/GHSA-vxf5-wxwp-m7g9Third Party Advisory

Timeline

Published: Aug 12, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-37699?

How severe is CVE-2021-37699?

CVE-2021-37699 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 1.20% probability of exploitation in the next 30 days.

How do I fix CVE-2021-37699?

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-2021-37699?

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

Scan your code now

Source: NVD / NIST