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No exploitation reportedFix available

CVE-2018-6342

No exploitation reported by the sources we read.

  • Published2018-12-31
  • Fixed in5.0.2 · 4.2.2 · 3.1.2 · 2.0.2 · 1.0.4
  • WeaknessCWE-78

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2018-12-3122:29CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2018-6342?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2018-6342?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Facebook react-dev-utilsversion to verify
BranchAffectedFixed in
5.0≥ 5.0.0, < 5.0.25.0.2
4.x≥ 4.0.0, < 4.2.24.2.2
3.x≥ 3.0.0, < 3.1.23.1.2
2.0≥ 2.0.0, < 2.0.22.0.2
1.0≥ 1.0.0, < 1.0.41.0.4

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

  1. Update Facebook react-dev-utils to 5.0.2 · 4.2.2 · 3.1.2 · 2.0.2 · 1.0.4

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub

Sources

  • CISA-ADPSSVC decisionnone2025-05-06
  • OpenCVESSVC decisionnone—
  • CISA-ADPCVSS 3.19.82025-05-06
  • NVDCVSS 3.19.8read 2026-10-23
  • NVDCVSS 2.010read 2026-10-23
  • CNAweakness (CWE)CWE-78read 2026-10-23
  • NVDweakness (CWE)CWE-78read 2026-10-23
  • FIRST EPSSEPSS score2.8 %2026-10-22

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2018-12-31
Last Modified
2026-06-17
NVD status
Modified

Frequently asked questions

What is 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. 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.

Is CVE-2018-6342 actively exploited?

Active exploitation of CVE-2018-6342 has not been confirmed. Its EPSS score was 2.8% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2018-6342?

CVE-2018-6342 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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