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Fencer Vulns
critical 9.8

CVE-2018-5188 json

Memory safety bugs present in Firefox 60, Firefox ESR 60, and Firefox ESR 52.8.

published 2018-10-18 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-16973

cvss
9.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.9%
EPSS 3.9% chance of exploitation in 30 days, percentile 90%
public exploits
0
none known

Summary

Memory safety bugs present in Firefox 60, Firefox ESR 60, and Firefox ESR 52.8. 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 Thunderbird < 60, Thunderbird < 52.9, Firefox ESR < 60.1, Firefox ESR < 52.9, and Firefox < 61.

Patch / fix

  • Mozilla Thunderbird 52.9, 60
  • Mozilla Firefox ESR 52.9, 60.1
  • Mozilla Firefox 61
  • firefox-esr Debian 14, Debian 13, Debian 12 52.9.0esr-1
  • thunderbird Debian 14, Debian 13, Debian 12 1:52.9.0-1

debian advisories DEBIAN-CVE-2018-5188

  • firefox Ubuntu 14.04 LTS 61.0+build3-0ubuntu0.14.04.2
  • firefox Ubuntu 16.04 LTS 61.0+build3-0ubuntu0.16.04.2
  • firefox Ubuntu 18.04 LTS 61.0+build3-0ubuntu0.18.04.1
  • mozjs52 Ubuntu 18.04 LTS 52.9.1-0ubuntu0.18.04.1
  • thunderbird Ubuntu 14.04 LTS 1:52.9.1+build3-0ubuntu0.14.04.1
  • thunderbird Ubuntu 16.04 LTS 1:52.9.1+build3-0ubuntu0.16.04.1
  • thunderbird Ubuntu 18.04 LTS 1:52.9.1+build3-0ubuntu0.18.04.1

ubuntu advisories UBUNTU-CVE-2018-5188

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 52.9.1-1.el7_5
  • thunderbird RHEL 6 52.9.1-1.el6
  • firefox RHEL 6 60.1.0-5.el6
  • firefox RHEL 7 60.1.0-4.el7_5

red hat advisories RHSA-2018:2252RHSA-2018:2251RHSA-2018:2112RHSA-2018:2113

  • MozillaThunderbird SLE Workstation Extension 15 60.2.1-3.13.1
  • MozillaFirefox SLES 12 SP3, SLES 12 SP2-BCL, SLED 12 SP3 +9 more 52.9.0esr-109.38.2
  • MozillaFirefox SLES for SAP 11 SP4, SLES 11 SP4, SLES 11 SP3-TERADATA +3 more 52.9.0esr-72.38.6
  • MozillaFirefox SLE Module for Desktop Applications 15 52.9.0esr-3.7.12
  • MozillaThunderbird SLE Workstation Extension 15 52.9.1-3.7.1

suse advisories SUSE-SU-2018:3247-1SUSE-SU-2018:2322-2SUSE-SU-2018:2325-1SUSE-SU-2018:2322-1SUSE-SU-2018:2298-1SUSE-SU-2018:2174-1

  • firefox-esr openSUSE Tumbleweed 128.5.1-1.1
  • MozillaFirefox openSUSE Tumbleweed 92.0-1.2
  • MozillaThunderbird openSUSE Tumbleweed 91.1.1-1.1
  • MozillaThunderbird Package Hub 12 60.3.0-74.2
  • seamonkey Package Hub 15 2.49.4-bp150.3.3.1

opensuse advisories openSUSE-SU-2024:14572-1openSUSE-SU-2024:10600-1openSUSE-SU-2024:10601-1openSUSE-SU-2018:3687-1openSUSE-SU-2018:2807-1

  • firefox Arch Linux 61.0-1
  • thunderbird Arch Linux 52.9.1-1

arch linux advisories AVG-727AVG-728

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-2018-5188 updated cvss 9.8

Mozilla: Memory safety bugs fixed in Firefox 61, Firefox ESR 60.1, and Firefox ESR 52.9

  • Red Hat Enterprise Linux Client (v. 7) firefox 60.1.0-4.el7_5, thunderbird 52.9.1-1.el7_5 Red Hat Enterprise Linux Client Optional (v. 7) firefox 60.1.0-4.el7_5
    fixed: vendor fix RHSA-2018:2113
  • Red Hat Enterprise Linux Desktop (v. 6) firefox 60.1.0-5.el6, thunderbird 52.9.1-1.el6 Red Hat Enterprise Linux Desktop Optional (v. 6) firefox 60.1.0-5.el6
    fixed: vendor fix RHSA-2018:2112
  • Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) firefox 60.1.0-4.el7_5
    fixed: vendor fix RHSA-2018:2113
  • Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) thunderbird 52.9.1-1.el7_5
    fixed: vendor fix RHSA-2018:2252
  • Red Hat Enterprise Linux HPC Node Optional (v. 6) firefox 60.1.0-5.el6 Red Hat Enterprise Linux Server (v. 6) firefox 60.1.0-5.el6
    fixed: vendor fix RHSA-2018:2112
  • Red Hat Enterprise Linux Server (v. 7) firefox 60.1.0-4.el7_5
    fixed: vendor fix RHSA-2018:2113
  • Red Hat Enterprise Linux Server Optional (v. 6) firefox 60.1.0-5.el6, thunderbird 52.9.1-1.el6
    fixed: vendor fix RHSA-2018:2112
  • Red Hat Enterprise Linux Server Optional (v. 7) firefox 60.1.0-4.el7_5, thunderbird 52.9.1-1.el7_5
    fixed: vendor fix RHSA-2018:2113
show 5 more
  • Red Hat Enterprise Linux Workstation (v. 6) firefox 60.1.0-5.el6, thunderbird 52.9.1-1.el6
    fixed: vendor fix RHSA-2018:2112
  • Red Hat Enterprise Linux Workstation (v. 7) firefox 60.1.0-4.el7_5, thunderbird 52.9.1-1.el7_5
    fixed: vendor fix RHSA-2018:2113
  • Red Hat Enterprise Linux Workstation Optional (v. 6) firefox 60.1.0-5.el6
    fixed: vendor fix RHSA-2018:2112
  • Red Hat Enterprise Linux Workstation Optional (v. 7) firefox 60.1.0-4.el7_5
    fixed: vendor fix RHSA-2018:2113
  • Red Hat Enterprise Linux 8 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

3.94% chance of exploitation in the next 30 days, higher than 90% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.0 9.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Affected products

  • Mozilla Thunderbird
  • Mozilla Firefox ESR
  • Mozilla Firefox

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.