CVE-2018-6342

CRITICAL

9.8

CVSS Score

Published: December 31, 2018 at 10:00 PM UTC

Updated: June 17, 2026 at 02:01 AM UTC

1 product affected across 1 vendorReact Dev Utils· also runs on 1 platform

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Severity

CRITICAL9.8

Exploit prediction

EPSS 3%

SSVC

No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

React Dev Utils · Facebook

95%

v ≥ 1.0.0v ≥ 2.0.0v ≥ 3.0.0v ≥ 4.0.0v ≥ 5.0.01.0.0 ≤ v < 1.0.42.0.0 ≤ v < 2.0.23.0.0 ≤ v < 3.1.24.0.0 ≤ v < 4.2.25.0.0 ≤ v < 5.0.21.0.0 1.0.4 2.0.0 2.0.2 3.0.0 3.1.2 4.0.0 4.2.2 5.0.0 5.0.2

Vendor states this is fixed in 1.0.0 (unaffected)

Affected range stops below 1.0.4, so it looks safe — our inference, not a vendor statement

Affected range stops below 2.0.2, so it looks safe — our inference, not a vendor statement

Affected range stops below 3.1.2, so it looks safe — our inference, not a vendor statement

Affected range stops below 4.2.2, so it looks safe — our inference, not a vendor statement

Affected range stops below 5.0.2, so it looks safe — our inference, not a vendor statement

microsoft-windows (environment)

Runs on — not affected

The affected product only carries this flaw when running on these platforms. The platforms themselves are not vulnerable.

Windows · Microsoft

95%

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (2)

x_refsource_MISCThird Party Advisory

Source: [email protected]

https://github.com/facebook/create-react-app/pull/4866

x_refsource_MISCRelease NotesThird Party Advisory

Source: [email protected]

https://github.com/facebook/create-react-app/releases/tag/v1.1.5

SSVC — Action Prioritization

SSVCNo known exploitAutomatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

9.8CRITICALCISA-ADP

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: HIGH
Availability: HIGH

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-78

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