Is CVE-2018-12387 in the CISA KEV catalog?

No. CVE-2018-12387 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2018-12387?

CVE-2018-12387 has a CVSS v3 base score of 9.1 (CRITICAL).

What is the EPSS score for CVE-2018-12387?

CVE-2018-12387 has an EPSS score of 9.59% (95th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2018-12387?

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

CVE & CISA-KEV Catalog

CVE-2018-12387

CRITICALEPSS 95th pctl

9.1

CVSS v3

NVD

Description

A vulnerability where the JavaScript JIT compiler inlines Array.prototype.push with multiple arguments that results in the stack pointer being off by 8 bytes after a bailout. This leaks a memory address to the calling function which can be used as part of an exploit inside the sandboxed content process. This vulnerability affects Firefox ESR < 60.2.2 and Firefox < 62.0.3.

CWE-20Improper Input Validation

How to fix

Remediation Available

firefoxDebian

Fixed in:62.0.3-1CVE-2018-12387

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

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 InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

9.59%probability of exploitation in 30 days

95thpercentile

High risk: more likely to be exploited than 95% of all known CVEs.

References

Patch1

bugzilla.mozilla.org

Vendor Advisory1

mozilla.org

Third-Party Advisory7

Related Vulnerabilities

Other CWE-20 (Improper Input Validation) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-3400	Critical	10.0	100%	KEV + Ransom	-
CVE-2021-45105	Medium	5.9	100%	-	Fix
CVE-2021-44228	Critical	10.0	100%	KEV + Ransom	Fix
CVE-2021-21985	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2018-7600	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2020-3452	High	7.5	100%	KEV	Fix

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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.