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CVE-2021-43803

7.5 · HIGH

Next.js is a React framework.

Published Dec 10, 2021CWE-20EPSS 47.25%

Overview

CVE-2021-43803 is a high-severity vulnerability. It was published on December 10, 2021 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Next.js is a React framework. In versions of Next.js prior to 12.0.5 or 11.1.3, invalid or malformed URLs could lead to a server crash. In order to be affected by this issue, the deployment must use Next.js versions above 11.1.0 and below 12.0.5, Node.js above 15.0.0, and next start or a custom server. Deployments on Vercel are not affected, along with similar environments where invalid requests are filtered before reaching Next.js. Versions 12.0.5 and 11.1.3 contain patches for this issue.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/vercel/next.js/commit/6d98b4fb4315dec1badecf0e9bdc212a4272b264GitHubgithub.com/vercel/next.js/pull/32080GitHubgithub.com/vercel/next.js/releases/tag/v11.1.3GitHubgithub.com/vercel/next.js/releases/v12.0.5GitHubgithub.com/vercel/next.js/security/advisories/GHSA-25mp-g6fv-mqxxGitHubgithub.com/vercel/next.js/commit/6d98b4fb4315dec1badecf0e9bdc212a4272b264GitHubgithub.com/vercel/next.js/pull/32080GitHubgithub.com/vercel/next.js/releases/tag/v11.1.3GitHubgithub.com/vercel/next.js/releases/v12.0.5GitHubgithub.com/vercel/next.js/security/advisories/GHSA-25mp-g6fv-mqxx

How CyberStrike helps

Frequently asked questions

What is CVE-2021-43803?

CVE-2021-43803 is a high-severity vulnerability. It was published on December 10, 2021 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2021-43803?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-43803?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-43803?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-43803 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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