Is CVE-2018-12386 in the CISA KEV catalog?

No. CVE-2018-12386 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2018-12386?

CVE-2018-12386 has a CVSS v3 base score of 8.1 (HIGH).

What is the EPSS score for CVE-2018-12386?

CVE-2018-12386 has an EPSS score of 13.42% (96th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2018-12386?

Upgrade firefox on debian unstable to 62.0.3-1 or later. Fixes are available for 4 affected products.

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

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

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

Patch1

bugzilla.mozilla.org

Vendor Advisory1

mozilla.org

Third-Party Advisory7

Related Vulnerabilities

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

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-41646	Critical	9.8	43%	-	Fix
CVE-2017-5115	High	8.8	26%	-	Fix
CVE-2018-12453	High	7.5	24%	-	Fix
CVE-2018-3843	High	8.8	24%	-	-
CVE-2017-3106	High	8.8	22%	-	-
CVE-2018-5007	High	8.8	18%	-	-

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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.