CVE-2018-6342 — react-dev-utils on Windows allows developers to run a local webserver for accepting various commands, including a command to launch an editor

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CRITICAL

react-dev-utils on Windows allows developers to run a local webserver for accepting various commands, including a command to launch an editor

Published Dec 31, 2018

9.8

CRITICAL

CVSS 3.1

EPSS 2.84%

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.

Affected products

Vendor Facebook Product React-Dev-Utils Default
n/a
- Version
  1.0.0
  Status
  affected
  Constraints
  <unspecified
- Version
  1.0.4
  Status
  affected
  Constraints
  -
- Version
  2.0.0
  Status
  affected
  Constraints
  <unspecified
- Version
  2.0.2
  Status
  affected
  Constraints
  -
- Version
  3.0.0
  Status
  affected
  Constraints
  <unspecified
- Version
  3.1.2
  Status
  affected
  Constraints
  -
- Version
  4.0.0
  Status
  affected
  Constraints
  <unspecified
- Version
  4.2.2
  Status
  affected
  Constraints
  -
- Version
  5.0.0
  Status
  affected
  Constraints
  <unspecified
- Version
  5.0.2
  Status
  affected
  Constraints
  -
- Version
  unspecified
  Status
  unaffected
  Constraints
  <1.0.0

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

Facebook

React-Dev-Utils

n/a

Version	Status	Constraints
1.0.0	affected	<unspecified
1.0.4	affected	-
2.0.0	affected	<unspecified
2.0.2	affected	-
3.0.0	affected	<unspecified
3.1.2	affected	-
4.0.0	affected	<unspecified
4.2.2	affected	-
5.0.0	affected	<unspecified
5.0.2	affected	-
unspecified	unaffected	<1.0.0

react-dev-utils

npm

Introduced 5.0.0 Fixed 5.0.2
react-dev-utils

npm

Introduced 1.0.0 Fixed 1.0.4
react-dev-utils

npm

Introduced 2.0.0 Fixed 2.0.2
react-dev-utils

npm

Introduced 3.0.0 Fixed 3.1.2
react-dev-utils

npm

Introduced 4.0.0 Fixed 4.2.2

Ecosystem	Package	Introduced	Fixed
npm	react-dev-utils	5.0.0	5.0.2
npm	react-dev-utils	1.0.0	1.0.4
npm	react-dev-utils	2.0.0	2.0.2
npm	react-dev-utils	3.0.0	3.1.2
npm	react-dev-utils	4.0.0	4.2.2

Remediation

No remediation recorded yet.

Metrics

2.84% 0.02845

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.

EPSS probability 0.02845

Score over time

2021–2026

EPSS v1
EPSS v2
EPSS v3
EPSS v4
EPSS v5

Percentile over time

EPSS v1
EPSS v2
EPSS v3
EPSS v4
EPSS v5

Table of values (16 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 1, 2026	2.84% (0.02845)	86.20th	v5 (v2026.06.15)
Jun 15, 2026	2.84% (0.02845)	84.80th	v5 (v2026.06.15)
Mar 30, 2025	0.79% (0.00794)	71.73th	v4 (v2025.03.14)
Mar 29, 2025	2.51% (0.02512)	75.60th	v4 (v2025.03.14)
Mar 17, 2025	0.79% (0.00794)	72.29th	v4 (v2025.03.14)
Dec 12, 2024	0.19% (0.00192)	58.01th	v3 (v2023.03.01)
May 23, 2024	0.19% (0.00192)	56.62th	v3 (v2023.03.01)
Mar 7, 2023	0.18% (0.00185)	53.99th	v3 (v2023.03.01)
Mar 6, 2023	0.89% (0.00885)	27.89th	v2 (v2022.01.01)
Sep 10, 2022	0.89% (0.00885)	26.24th	v2 (v2022.01.01)
Apr 1, 2022	0.89% (0.00885)	24.24th	v2 (v2022.01.01)
Feb 4, 2022	0.89% (0.00885)	10.50th	v2 (v2022.01.01)
Feb 3, 2022	11.86% (0.11857)	88.52th	v1
Jan 6, 2022	11.86% (0.11857)	88.38th	v1
Sep 1, 2021	11.86% (0.11857)	95.70th	v1
Apr 14, 2021	11.86% (0.11857)	0.00th	v1

Weaknesses (1)

CWE-78

OS Command Injection

References (5)

https://github.com/advisories/GHSA-29gp-92wp-94q8
Advisory
https://github.com/facebook/create-react-app/pull/4866
x_refsource_MISCThird Party Advisory
https://github.com/facebook/create-react-app/releases/tag/v1.1.5
x_refsource_MISCRelease NotesThird Party Advisory
https://nvd.nist.gov/vuln/detail/CVE-2018-6342
https://www.npmjs.com/advisories/695

Link	Providers	Tags
https://github.com/advisories/GHSA-29gp-92wp-94q8		Advisory
https://github.com/facebook/create-react-app/pull/4866		x_refsource_MISCThird Party Advisory
https://github.com/facebook/create-react-app/releases/tag/v1.1.5		x_refsource_MISCRelease NotesThird Party Advisory
https://nvd.nist.gov/vuln/detail/CVE-2018-6342
https://www.npmjs.com/advisories/695