Threat Intelligence / CVE / CVE-2025-29927

CVE-2025-29927 — vercel next.js

CVSS v3.1 9.1 (CRITICAL) · EPSS 92.1% (higher than 99.7% of all scored CVEs) · Priority 8.5/10 · Published 2025-03-21

As of 2025-04-08, CVE-2025-29927 is a CRITICAL-severity vulnerability in vercel next.js, CVSS v3.1 9.1, EPSS 92.1% (99.7th percentile). Threadlinqs Intelligence links 2 tracked threat campaigns to CVE-2025-29927, most recently “PCPJack Worm — Cloud Credential Theft Framework Evicting TeamPCP Infections (CVE-2025-29927, CVE-2025-55182, CVE-2026-1357, CVE-2025-9501, CVE-2025-48703)”.

Last updated: 2025-04-08

What is CVE-2025-29927?

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.

The record classifies CVE-2025-29927 under weakness class CWE-285. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality, integrity. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 541 days ago.

Severity and exploitation probability

CVSS v3.1 base score
9.1 — CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
EPSS (FIRST)
92.1% probability of exploitation in the next 30 days, higher than 99.7% of all scored CVEs
CISA KEV
Not listed in the CISA Known Exploited Vulnerabilities catalog
Threadlinqs priority
8.5/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
Published
2025-03-21, last modified 2025-04-08

Is CVE-2025-29927 being exploited?

It currently carries a trending score of 30 in the Threadlinqs vulnerability feed.

Affected products and versions

How to fix CVE-2025-29927

No vendor patch reference has been recorded for CVE-2025-29927 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

Threat activity tracking CVE-2025-29927

2 tracked threats in the Threadlinqs corpus reference CVE-2025-29927, either in the campaign’s CVE list or as an indicator on the campaign record.

Sources

Seeded from cveorg and not yet processed by the Threadlinqs enrichment pipeline, so blank CVSS, EPSS or KEV fields above mean NOT MEASURED rather than measured-absent.

Full detection coverage & IOCs for threats exploiting CVE-2025-29927 are available via the Threadlinqs MCP server (Purple tier). View plans →

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