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CVE-2018-12386

HighPublished

A vulnerability in register allocation in JavaScript can lead to type confusion, allowing for an arbitrary read and write. This leads to remote code...

Published: Oct 18, 2018
Updated: Aug 5, 2024
Assigning CNA: mozilla
Evidence observed: Aug 8, 2026

Primary CVSS

8.1/ 10High

nvd · CVSS 3.0

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

EPSS probability estimate

12.4%

Moderate · next 30 days

Percentile: 96.1%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

A vulnerability in register allocation in JavaScript can lead to type confusion, allowing for an arbitrary read and write. This leads to remote code execution inside the sandboxed content process when triggered. This vulnerability affects Firefox ESR < 60.2.2 and Firefox < 62.0.3.

Sources

cve-2018-12386PoC
CVE-2018-12386 - Firefox Sandboxed RCE Exploit for Linux (Firefox <v62.0.3)
cve-2018-12386Exploit
CVE-2018-12386 - Firefox Sandboxed RCE Exploit for Linux (Firefox <v62.0.3)

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