CVE-2018-6342

Name: CVE-2018-6342
Creator: NVD / NIST
Published: 2018-12-31T22:29:00.467+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 2.84%

Last modified Jun 17, 2026

CVE-2018-6342 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. react-dev-utils on Windows allows developers to run a local webserver for accepting various commands, including a command to launch an editor. The input to that command was not properly sanitized, allowing an attacker who can make a network request to the server (either via CSRF or by direct request) to execute arbitrary commands on the targeted system. EPSS estimates a 2.84% chance of exploitation in the next 30 days.

Description

react-dev-utils on Windows allows developers to run a local webserver for accepting various commands, including a command to launch an editor. The input to that command was not properly sanitized, allowing an attacker who can make a network request to the server (either via CSRF or by direct request) to execute arbitrary commands on the targeted system. This issue affects multiple branches: 1.x.x prior to 1.0.4, 2.x.x prior to 2.0.2, 3.x.x prior to 3.1.2, 4.x.x prior to 4.2.2, and 5.x.x prior to 5.0.2.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

2.84%

84.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Facebook	React-Dev-Utils	>= 1.0.0, < 1.0.4
Facebook	React-Dev-Utils	>= 2.0.0, < 2.0.2
Facebook	React-Dev-Utils	>= 3.0.0, < 3.1.2
Facebook	React-Dev-Utils	>= 4.0.0, < 4.2.2
Facebook	React-Dev-Utils	>= 5.0.0, < 5.0.2

References

https://github.com/facebook/create-react-app/pull/4866Third Party Advisory
https://github.com/facebook/create-react-app/releases/tag/v1.1.5Release Notes, Third Party Advisory
https://github.com/facebook/create-react-app/pull/4866Third Party Advisory
https://github.com/facebook/create-react-app/releases/tag/v1.1.5Release Notes, Third Party Advisory

Timeline

Published: Dec 31, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-6342?

How severe is CVE-2018-6342?

CVE-2018-6342 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 2.84% probability of exploitation in the next 30 days.

How do I fix CVE-2018-6342?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2018-6342?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST