CVE-2021-37699: Vercel Next.js

Medium severity, CVSS 6.1. EPSS: 1% chance of exploitation in the next 30 days.

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.

Affected products

• Vercel Next.js: from 10.0.5, up to and including 10.2.0; from 11.0.0, up to and including 11.0.1

Published 2021-08-12. Last modified 2026-06-17.