CVE-2018-12387

Name: CVE-2018-12387
Creator: NVD / NIST
Published: 2018-10-18T13:29:06.4+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 9.59%

Last modified Jun 17, 2026

CVE-2018-12387 is a vulnerability of currently unknown severity. 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. EPSS estimates a 9.59% chance of exploitation in the next 30 days.

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.

Metrics

EPSS Probability

9.59%

94.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-20

Affected Software

Vendor	Product	Versions
Redhat	Enterprise Linux Desktop	6.0
Redhat	Enterprise Linux Desktop	7.0
Redhat	Enterprise Linux Server	6.0
Redhat	Enterprise Linux Server	7.0
Redhat	Enterprise Linux Server Aus	7.6
Redhat	Enterprise Linux Server Eus	7.5
Redhat	Enterprise Linux Server Eus	7.6
Redhat	Enterprise Linux Server Tus	7.6
Redhat	Enterprise Linux Workstation	6.0
Redhat	Enterprise Linux Workstation	7.0
Debian	Debian Linux	9.0
Canonical	Ubuntu Linux	14.04
Canonical	Ubuntu Linux	16.04
Canonical	Ubuntu Linux	18.04
Mozilla	Firefox	< 60.2.2
Mozilla	Firefox	< 62.0.3

References

http://www.securityfocus.com/bid/105460Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1041770Third Party Advisory, VDB Entry
https://access.redhat.com/errata/RHSA-2018:2881Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:2884Third Party Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1493903Exploit, Issue Tracking, Patch, Vendor Advisory
https://security.gentoo.org/glsa/201810-01Third Party Advisory
https://usn.ubuntu.com/3778-1/Third Party Advisory
https://www.debian.org/security/2018/dsa-4310Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2018-24/Vendor Advisory
http://www.securityfocus.com/bid/105460Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1041770Third Party Advisory, VDB Entry
https://access.redhat.com/errata/RHSA-2018:2881Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:2884Third Party Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1493903Exploit, Issue Tracking, Patch, Vendor Advisory
https://security.gentoo.org/glsa/201810-01Third Party Advisory
https://usn.ubuntu.com/3778-1/Third Party Advisory
https://www.debian.org/security/2018/dsa-4310Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2018-24/Vendor Advisory

Timeline

Published: Oct 18, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-12387?

How severe is CVE-2018-12387?

Severity scoring for CVE-2018-12387 is pending analysis. The EPSS model estimates a 9.59% probability of exploitation in the next 30 days.

How do I fix CVE-2018-12387?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2018-12387?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST