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Fencer Vulns
high 8.8

CVE-2018-12389 json

Mozilla developers and community members reported memory safety bugs present in Firefox ESR 60.2.

published 2019-02-28 7 y ago modified 2026-06-17 4 mo ago also EUVD-2018-4363

cvss
8.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.3%
EPSS 2.3% chance of exploitation in 30 days, percentile 83%
public exploits
0
none known

Summary

Mozilla developers and community members reported memory safety bugs present in Firefox ESR 60.2. Some of these bugs showed evidence of memory corruption and we presume that with enough effort that some of these could be exploited to run arbitrary code. This vulnerability affects Firefox ESR < 60.3 and Thunderbird < 60.3.

Patch / fix

  • Mozilla Firefox ESR 60.3
  • Mozilla Thunderbird 60.3
  • firefox-esr Debian 14, Debian 13, Debian 12 60.3.0esr-1
  • thunderbird Debian 14, Debian 13, Debian 12 1:60.3.0-1

debian advisories DEBIAN-CVE-2018-12389

  • thunderbird Ubuntu 14.04 LTS 1:60.4.0+build2-0ubuntu0.14.04.1
  • thunderbird Ubuntu 16.04 LTS 1:60.4.0+build2-0ubuntu0.16.04.1
  • thunderbird Ubuntu 18.04 LTS 1:60.4.0+build2-0ubuntu0.18.04.1

ubuntu advisories UBUNTU-CVE-2018-12389

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • thunderbird RHEL 7 60.3.0-1.el7_5
  • thunderbird RHEL 6 60.3.0-1.el6
  • firefox RHEL 6 60.3.0-1.el6
  • firefox RHEL 7 60.3.0-1.el7_5

red hat advisories RHSA-2018:3532RHSA-2018:3531RHSA-2018:3006RHSA-2018:3005

  • MozillaFirefox SLES 12 SP4, SLES 12 SP3, SLES 12 SP2-BCL +13 more 60.3.0-109.50.2
  • MozillaThunderbird SLE Workstation Extension 15 60.3.0-3.17.2
  • MozillaFirefox SLE Module for Desktop Applications 15 60.3.0-3.17.1

suse advisories SUSE-SU-2018:3749-3SUSE-SU-2018:3749-2SUSE-SU-2018:3769-1SUSE-SU-2018:3749-1SUSE-SU-2018:3656-1

  • MozillaThunderbird openSUSE Tumbleweed 91.1.1-1.1
  • MozillaThunderbird Package Hub 12 60.3.0-74.2

opensuse advisories openSUSE-SU-2024:10601-1openSUSE-SU-2018:3687-1

  • thunderbird Arch Linux 60.3.0-1

arch linux advisories AVG-803

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2018-12389 updated cvss 8.8

Mozilla: Memory safety bugs fixed in Firefox ESR 60.3

  • Red Hat Enterprise Linux Client (v. 7) firefox 60.3.0-1.el7_5, thunderbird 60.3.0-1.el7_5 Red Hat Enterprise Linux Client Optional (v. 7) firefox 60.3.0-1.el7_5
    fixed: vendor fix RHSA-2018:3005
  • Red Hat Enterprise Linux Desktop (v. 6) firefox 60.3.0-1.el6, thunderbird 60.3.0-1.el6 Red Hat Enterprise Linux Desktop Optional (v. 6) firefox 60.3.0-1.el6
    fixed: vendor fix RHSA-2018:3006
  • Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) firefox 60.3.0-1.el7_5
    fixed: vendor fix RHSA-2018:3005
  • Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) thunderbird 60.3.0-1.el7_5
    fixed: vendor fix RHSA-2018:3532
  • Red Hat Enterprise Linux HPC Node Optional (v. 6) firefox 60.3.0-1.el6 Red Hat Enterprise Linux Server (v. 6) firefox 60.3.0-1.el6
    fixed: vendor fix RHSA-2018:3006
  • Red Hat Enterprise Linux Server (v. 7) firefox 60.3.0-1.el7_5
    fixed: vendor fix RHSA-2018:3005
  • Red Hat Enterprise Linux Server Optional (v. 6) firefox 60.3.0-1.el6, thunderbird 60.3.0-1.el6
    fixed: vendor fix RHSA-2018:3006
  • Red Hat Enterprise Linux Server Optional (v. 7) firefox 60.3.0-1.el7_5, thunderbird 60.3.0-1.el7_5
    fixed: vendor fix RHSA-2018:3005
show 5 more
  • Red Hat Enterprise Linux Workstation (v. 6) firefox 60.3.0-1.el6, thunderbird 60.3.0-1.el6
    fixed: vendor fix RHSA-2018:3006
  • Red Hat Enterprise Linux Workstation (v. 7) firefox 60.3.0-1.el7_5, thunderbird 60.3.0-1.el7_5
    fixed: vendor fix RHSA-2018:3005
  • Red Hat Enterprise Linux Workstation Optional (v. 6) firefox 60.3.0-1.el6
    fixed: vendor fix RHSA-2018:3006
  • Red Hat Enterprise Linux Workstation Optional (v. 7) firefox 60.3.0-1.el7_5
    fixed: vendor fix RHSA-2018:3005
  • Red Hat Enterprise Linux 8 firefox, thunderbird
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

2.35% chance of exploitation in the next 30 days, higher than 83% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.0 8.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P

Affected products

  • Mozilla Firefox ESR
  • Mozilla Thunderbird

Classification

Weakness
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.