Read the docs
TI-2018-08886 Aliases CVE-2018-12386GHSA-5vgc-hmw3-287j

Incorrect type conversion in Mozilla Firefox ESR

Priority MEDIUM 50CWE-704Published · Updated

Key facts

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

Attack profile from CVSS 3.0 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-704 and the CVSS impact.

Summary

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.

Why it matters now

EPSS 0.13524 96th 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-2018-08887 Improper input validation in Mozilla Firefox ESRPriority MEDIUM 51
    • 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-2018-08887 Improper input validation in Mozilla Firefox ESRPriority MEDIUM 51
    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-2018-08887 Improper input validation in Mozilla Firefox ESRPriority MEDIUM 51
    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-2018-08887 Improper input validation in Mozilla Firefox ESRPriority MEDIUM 51
    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-2018-12386
  2. 2026-10-03 Alias added: GHSA-5vgc-hmw3-287j

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