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CVE-2025-29927

9.1 · CRITICAL

Next.js is a React framework for building full-stack web applications.

Published Mar 21, 2025CWE-285EPSS 99.22%

Overview

CVE-2025-29927 is a critical-severity vulnerability. It was published on March 21, 2025 and has a CVSS 3.1 base score of 9.1 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.1, rated CRITICAL. 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 for building full-stack web applications. Starting in version 1.11.4 and prior to versions 12.3.5, 13.5.9, 14.2.25, and 15.2.3, it is possible to bypass authorization checks within a Next.js application, if the authorization check occurs in middleware. If patching to a safe version is infeasible, it is recommend that you prevent external user requests which contain the x-middleware-subrequest header from reaching your Next.js application. This vulnerability is fixed in 12.3.5, 13.5.9, 14.2.25, and 15.2.3.

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/52a078da3884efe6501613c7834a3d02a91676d2GitHubgithub.com/vercel/next.js/commit/5fd3ae8f8542677c6294f32d18022731eab6fe48GitHubgithub.com/vercel/next.js/releases/tag/v12.3.5GitHubgithub.com/vercel/next.js/releases/tag/v13.5.9GitHubgithub.com/vercel/next.js/security/advisories/GHSA-f82v-jwr5-mffwRefwww.openwall.com/lists/oss-security/2025/03/23/3Refwww.openwall.com/lists/oss-security/2025/03/23/4Refsecurity.netapp.com/advisory/ntap-20250328-0002/

How CyberStrike helps

Frequently asked questions

What is CVE-2025-29927?

CVE-2025-29927 is a critical-severity vulnerability. It was published on March 21, 2025 and has a CVSS 3.1 base score of 9.1 (CRITICAL).

How severe is CVE-2025-29927?

This vulnerability has a CVSS 3.1 base score of 9.1, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2025-29927?

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-2025-29927?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-29927 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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