CVE & CISA-KEV Catalog

CVE-2018-12386

HIGHEPSS 96th pctl
8.1
CVSS v3
NVD

Description

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.

CWE-704

How to fix

Remediation Available
firefoxDebian
Fixed in:62.0.3-1CVE-2018-12386
firefoxUbuntu
Fixed in:62.0.3+build1-0ubuntu0.14.04.2USN-3778-1
Fixed in:62.0.3+build1-0ubuntu0.16.04.2USN-3778-1
Fixed in:62.0.3+build1-0ubuntu0.18.04.1USN-3778-1
DeveloperEditionWindows application
Affected:60.2.2Fixed in:60.2.2Mozilla
Affected:62.0.3Fixed in:62.0.3Mozilla
Mozilla Firefox (en-US)Windows application
Affected:62.0.3Fixed in:62.0.3Mozilla
Affected:60.2.2Fixed in:60.2.2Mozilla

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Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionRequired
ScopeUnchanged

Impact

ConfidentialityHigh
IntegrityHigh
AvailabilityNone

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

Exploit Intelligence

13.42%probability of exploitation in 30 days
96thpercentile

Very high risk: more likely to be exploited than 96% of all known CVEs.

References

Vendor Advisory1

Related Vulnerabilities

Other CWE-704 vulnerabilities, ordered by exploit likelihood. View all

CVESeverityCVSSEPSSExploitedFix
CVE-2025-41646Critical9.844%-Fix
CVE-2017-5115High8.826%-Fix
CVE-2018-12453High7.524%-Fix
CVE-2018-3843High8.824%--
CVE-2017-3106High8.822%--
CVE-2018-5007High8.818%--

Common questions

How do I fix CVE-2018-12386?

Published advisories record a fix for 4 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2018-12386 being actively exploited?

Not that we know of. CVE-2018-12386 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 13.4% is the estimated probability that it will be exploited in the next 30 days. That is higher than 96% of all scored CVEs.

How severe is CVE-2018-12386?

CVE-2018-12386 has a CVSS v3 base score of 8.1, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2018-12386 affect?

Published advisories record a fix for firefox (Debian), firefox (Ubuntu), DeveloperEdition (Windows application), Mozilla Firefox (en-US) (Windows application). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-11-25.