CVE-2024-39693 Overview
CVE-2024-39693 is a Denial of Service (DoS) vulnerability affecting Vercel Next.js, a widely deployed React framework for production web applications. Attackers can trigger a server crash by sending specially crafted requests, disrupting the availability of applications built on the framework. The flaw is categorized under [CWE-400] (Uncontrolled Resource Consumption) and is exploitable over the network without authentication or user interaction. Vercel resolved the issue in Next.js 13.5 and later releases. The vulnerability impacts availability only, with no direct effect on confidentiality or integrity.
Critical Impact
Unauthenticated remote attackers can crash Next.js servers, taking dependent web applications offline.
Affected Products
- Vercel Next.js versions prior to 13.5
- Node.js deployments running vulnerable Next.js releases
- Web applications relying on the Next.js server runtime
Discovery Timeline
- 2024-07-10 - CVE-2024-39693 published to the National Vulnerability Database
- 2025-09-10 - Last updated in NVD database
Technical Details for CVE-2024-39693
Vulnerability Analysis
The vulnerability is a network-reachable Denial of Service condition in the Next.js server runtime. An attacker submits a request that the framework fails to process safely, causing the Node.js process hosting the Next.js application to crash. Because Next.js commonly runs as the front-end server for production sites, a successful crash interrupts availability for all users of the affected service. The flaw requires no privileges and no user interaction, making it suitable for opportunistic scanning and automated abuse.
The issue is classified under [CWE-400], indicating uncontrolled resource consumption in request handling. Vercel addressed the root cause in Next.js 13.5, where the request-processing logic was corrected to avoid the crash condition. Restart loops triggered by repeated exploitation can compound the impact in environments without process supervision or rate limiting at the edge.
Root Cause
The root cause is improper handling of attacker-controlled input within the Next.js server runtime, resulting in an unhandled error path that terminates the Node.js process. Refer to the Vercel GHSA-fq54-2j52-jc42 advisory for the upstream technical description and commit references.
Attack Vector
Exploitation occurs remotely over HTTP. An attacker sends a crafted request to any exposed Next.js endpoint. The server processes the malformed input and crashes. No authentication tokens, session state, or user interaction are required, which lowers the barrier to abuse and supports repeated probing across exposed hosts.
No public proof-of-concept exploit code has been published, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog. See the Vercel Security Advisory for vendor-supplied details.
Detection Methods for CVE-2024-39693
Indicators of Compromise
- Repeated unexpected exits or restarts of the Node.js process hosting Next.js without corresponding deployment activity.
- Spikes in HTTP 5xx responses correlated with sudden drops in active request handlers.
- Application logs ending abruptly mid-request, followed by process supervisor restart entries.
Detection Strategies
- Inventory all Next.js deployments and compare installed versions against the 13.5 fixed baseline using package manifests such as package.json and package-lock.json.
- Alert on anomalous crash-restart cycles in container orchestrators or process managers like pm2, systemd, or Kubernetes CrashLoopBackOff events.
- Correlate web application firewall logs with backend availability metrics to identify request patterns that precede crashes.
Monitoring Recommendations
- Track Next.js process uptime, exit codes, and restart counts as first-class telemetry.
- Monitor request error rates and latency at the load balancer or CDN tier to identify availability degradation early.
- Forward Node.js stderr and unhandled exception logs to a centralized analytics platform for trend analysis.
How to Mitigate CVE-2024-39693
Immediate Actions Required
- Upgrade Next.js to version 13.5 or later across all production and staging environments.
- Audit dependencies for transitive use of vulnerable Next.js builds in monorepos and shared libraries.
- Place a web application firewall or rate-limiting proxy in front of exposed Next.js servers to throttle abusive traffic.
- Ensure process supervisors restart crashed Node.js workers automatically while alerting on excessive restart rates.
Patch Information
Vercel resolved CVE-2024-39693 in Next.js 13.5. Upgrade to the latest stable release on the 13.x or newer branch. Review the GitHub Security Advisory GHSA-fq54-2j52-jc42 for upgrade guidance and affected version ranges.
Workarounds
- No vendor-supplied workaround replaces upgrading; apply the patched release as the primary remediation.
- Deploy rate limiting and request validation at the edge to reduce the rate at which malformed requests reach the origin.
- Run Next.js behind a process supervisor configured to restart crashed workers and isolate failures from other tenants.
# Upgrade Next.js to a patched release
npm install next@latest
# Verify the installed version is 13.5 or later
npm ls next
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
