CVE-2018-6342

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 2.8%, top 15% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 3%CVSS: 9.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
60(Track)
EG Risk 60/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation3% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
85.2%
KEV
Not listed

Published

December 31, 2018

Last Modified

May 6, 2025

Advisory Details (2)

Auto-updated Jun 7, 2026
Patch available. Sources: github_pr, github_release.
github_release Patch Available

v1.1.5

Patch available: facebook/create-react-app v1.1.5

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

Use file name whitelist to prevent RCE

Patch available: facebook/create-react-app v2.0.4 (PR #4866 merged 2018-08-22)

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

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFixed inDependents
react-dev-utils—5.0.2—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 12× in last 7d / 45× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-23 14:15 UTCEPSS rescore
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  3. 2026-07-23 01:37 UTCEG score recompute
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  46. 2026-06-07 09:00 UTCOSV refresh
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  69. 2026-05-23 02:44 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2018-6342?
CVE-2018-6342 is a critical vulnerability published on December 31, 2018. 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…
When was CVE-2018-6342 disclosed?
CVE-2018-6342 was first published in the National Vulnerability Database on December 31, 2018, with the most recent update on May 6, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2018-6342 actively exploited?
CVE-2018-6342 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 85.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2018-6342?
CVE-2018-6342 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2018-6342?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-6342, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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