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TI-2018-08887 Aliases CVE-2018-12387GHSA-vfrp-p8qm-9m8x

Improper input validation in Mozilla Firefox ESR

Priority MEDIUM 51CWE-20Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · None · High
Fix status
Fixed

Attack profile from CVSS 3.0 · NVD. Fix status from CNA and Red Hat.

Summary

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.

Why it matters now

EPSS 0.0959 95th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed Firefox ESR (Mozilla): 60.2.2Firefox (Mozilla): 62.0.3Red Hat: 2 advisories

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
MozillaFirefox ESRbefore 60.2.260.2.2Patch availableCNA
MozillaFirefoxbefore 62.0.362.0.3Patch availableCNA
  • Firefox ESR VendorMozilla Affected before 60.2.2 Fixed in 60.2.2 Patch available CNA
  • Firefox VendorMozilla Affected before 62.0.3 Fixed in 62.0.3 Patch available CNA

CPE configurations NVD · 15

CPEVersionsRoleVendor
cpe:2.3:o:redhat:enterprise_linux_desktop:6.0:*:*:*:*:*:*:*6.0VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:*7.0VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_server:6.0:*:*:*:*:*:*:*6.0VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:*7.0VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_server_aus:7.6:*:*:*:*:*:*:*7.6VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_server_eus:7.5:*:*:*:*:*:*:*7.5VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_server_eus:7.6:*:*:*:*:*:*:*7.6VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_server_tus:7.6:*:*:*:*:*:*:*7.6VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_workstation:6.0:*:*:*:*:*:*:*6.0VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:*:*:*:*:*:*:*7.0VulnerableRed Hat
  • cpe:2.3:o:redhat:enterprise_linux_desktop:6.0:*:*:*:*:*:*:* Versions 6.0 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:* Versions 7.0 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_server:6.0:*:*:*:*:*:*:* Versions 6.0 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:* Versions 7.0 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_server_aus:7.6:*:*:*:*:*:*:* Versions 7.6 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_server_eus:7.5:*:*:*:*:*:*:* Versions 7.5 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_server_eus:7.6:*:*:*:*:*:*:* Versions 7.6 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_server_tus:7.6:*:*:*:*:*:*:* Versions 7.6 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_workstation:6.0:*:*:*:*:*:*:* Versions 6.0 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:*:*:*:*:*:*:* Versions 7.0 Vulnerable ·Red Hat
Show 5 more CPE
CPEVersionsRoleVendor
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*9.0VulnerableDebian
cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*14.04VulnerableCanonical
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*16.04VulnerableCanonical
cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*18.04VulnerableCanonical
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*before 60.2.2; before 62.0.3VulnerableMozilla
  • cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Debian
  • cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:* Versions 14.04 Vulnerable ·Canonical
  • cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:* Versions 16.04 Vulnerable ·Canonical
  • cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* Versions 18.04 Vulnerable ·Canonical
  • cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* Versions before 60.2.2; before 62.0.3 Vulnerable ·Mozilla

Remediation

  • Fix · CNA Firefox ESR (Mozilla) Fixed in 60.2.2
  • Fix · CNA Firefox (Mozilla) Fixed in 62.0.3

Red Hat 2 advisories

  • RHSA-2018:2884 Released 2018-10-08 · Red Hat rating Critical
    firefox security update
    • Red Hat Enterprise Linux Client (v. 7) firefox-60.2.2-1.el7_5
    • Red Hat Enterprise Linux Client Optional (v. 7) firefox-60.2.2-1.el7_5
    • Red Hat Enterprise Linux Server (v. 7) firefox-60.2.2-1.el7_5
    • Red Hat Enterprise Linux Server Optional (v. 7) firefox-60.2.2-1.el7_5
    • Red Hat Enterprise Linux Workstation (v. 7) firefox-60.2.2-1.el7_5
    • Red Hat Enterprise Linux Workstation Optional (v. 7) firefox-60.2.2-1.el7_5
    • Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) firefox-60.2.2-1.el7_5
  • RHSA-2018:2881 Released 2018-10-08 · Red Hat rating Critical
    firefox security update
    • Red Hat Enterprise Linux Desktop (v. 6) firefox-60.2.2-1.el6
    • Red Hat Enterprise Linux Desktop Optional (v. 6) firefox-60.2.2-1.el6
    • Red Hat Enterprise Linux HPC Node Optional (v. 6) firefox-60.2.2-1.el6
    • Red Hat Enterprise Linux Server (v. 6) firefox-60.2.2-1.el6
    • Red Hat Enterprise Linux Server Optional (v. 6) firefox-60.2.2-1.el6
    • Red Hat Enterprise Linux Workstation (v. 6) firefox-60.2.2-1.el6
    • Red Hat Enterprise Linux Workstation Optional (v. 6) firefox-60.2.2-1.el6

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Advisory ·

    Mozilla Firefox, Firefox ESR — USN-3778-1

    3 records Highest priority Priority MEDIUM 2 MEDIUM, 1 LOW

    Other records, highest priority first

    • TI-2018-08886 Incorrect type conversion in Mozilla Firefox ESRPriority MEDIUM 50
    • TI-2018-08885 Improper input validation in Mozilla ThunderbirdPriority LOW 31
    Show all 3 records → Advisory →
  • Advisory ·

    Mozilla Firefox, Firefox ESR — RHSA-2018:2881

    2 records Highest priority Priority MEDIUM 2 MEDIUM

    Other records, highest priority first

    • TI-2018-08886 Incorrect type conversion in Mozilla Firefox ESRPriority MEDIUM 50
    Show all 2 records → Advisory →
Show 2 more groups
  • Advisory ·

    Mozilla Firefox, Firefox ESR — RHSA-2018:2884

    2 records Highest priority Priority MEDIUM 2 MEDIUM

    Other records, highest priority first

    • TI-2018-08886 Incorrect type conversion in Mozilla Firefox ESRPriority MEDIUM 50
    Show all 2 records → Advisory →
  • Advisory ·

    Mozilla Firefox, Firefox ESR — DSA-4310

    2 records Highest priority Priority MEDIUM 2 MEDIUM

    Other records, highest priority first

    • TI-2018-08886 Incorrect type conversion in Mozilla Firefox ESRPriority MEDIUM 50
    Show all 2 records → Advisory →

Vendor assessments

Red Hat

Red Hat rating: Critical. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux Client (v. 7)Fixed RHSA-2018:2884
Red Hat Enterprise Linux Client Optional (v. 7)Fixed RHSA-2018:2884
Red Hat Enterprise Linux Desktop (v. 6)Fixed RHSA-2018:2881
Red Hat Enterprise Linux Desktop Optional (v. 6)Fixed RHSA-2018:2881
Red Hat Enterprise Linux HPC Node Optional (v. 6)Fixed RHSA-2018:2881
Red Hat Enterprise Linux Server (v. 6)Fixed RHSA-2018:2881
Red Hat Enterprise Linux Server (v. 7)Fixed RHSA-2018:2884
Red Hat Enterprise Linux Server Optional (v. 6)Fixed RHSA-2018:2881
Red Hat Enterprise Linux Server Optional (v. 7)Fixed RHSA-2018:2884
Red Hat Enterprise Linux Workstation (v. 6)Fixed RHSA-2018:2881
Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2018:2884
Red Hat Enterprise Linux Workstation Optional (v. 6)Fixed RHSA-2018:2881
Red Hat Enterprise Linux Workstation Optional (v. 7)Fixed RHSA-2018:2884
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7)Fixed RHSA-2018:2884
Not affected: 2 products
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7

Timeline

  1. 2026-10-02 Threatist record created from CVE-2018-12387
  2. 2026-10-03 Alias added: GHSA-vfrp-p8qm-9m8x

References

Exploit 1

Advisory 6

  • TI-2024-08981 Use after free in Mozilla Firefox KEVCVSS 3.1CRITICAL 9.8
  • TI-2022-09832 Use after free in Mozilla Firefox KEVCVSS 3.1CRITICAL 9.6
  • TI-2019-08769 Improper input validation in Mozilla Firefox ESR KEVCVSS 3.1CRITICAL 10.0
  • TI-2010-03577 Mozilla Firefox 3.5.x through 3.5.14 and 3.6.x through 3.6.11, Thunderbird 3.1.6 before… KEVCVSS 3.1CRITICAL 9.8
  • TI-2023-04799 Out-of-bounds write in Google Chrome KEVCVSS 3.1HIGH 8.8
  • TI-2023-04477 Out-of-bounds write in Google Chrome KEVCVSS 3.1HIGH 8.8
See all 3444 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences