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Fencer Vulns
high 8.8

CVE-2018-5125 json

Memory safety bugs were reported in Firefox 58 and Firefox ESR 52.6.

published 2018-06-11 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-16911

cvss
8.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.5%
EPSS 2.5% chance of exploitation in 30 days, percentile 84%
public exploits
0
none known

Summary

Memory safety bugs were reported in Firefox 58 and Firefox ESR 52.6. 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 < 52.7, Firefox ESR < 52.7, and Firefox < 59.

Patch / fix

  • Mozilla Thunderbird 52.7
  • Mozilla Firefox ESR 52.7
  • Mozilla Firefox 59
  • firefox-esr Debian 14, Debian 13, Debian 12 52.7.0esr-1
  • thunderbird Debian 14, Debian 13, Debian 12 1:52.7.0-1

debian advisories DEBIAN-CVE-2018-5125

  • firefox Ubuntu 14.04 LTS 59.0+build5-0ubuntu0.14.04.1
  • firefox Ubuntu 16.04 LTS 59.0+build5-0ubuntu0.16.04.1
  • firefox Ubuntu 18.04 LTS 59.0.1+build1-0ubuntu1
  • mozjs52 Ubuntu 18.04 LTS 52.8.1-0ubuntu0.18.04.1
  • thunderbird Ubuntu 14.04 LTS 1:52.7.0+build1-0ubuntu0.14.04.1
  • thunderbird Ubuntu 16.04 LTS 1:52.7.0+build1-0ubuntu0.16.04.1
  • thunderbird Ubuntu 18.04 LTS 1:52.7.0+build1-0ubuntu1

ubuntu advisories UBUNTU-CVE-2018-5125

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 6 52.7.0-1.el6_9
  • thunderbird RHEL 7 52.7.0-1.el7_4
  • firefox RHEL 7 52.7.0-1.el7_4
  • firefox RHEL 6 52.7.0-1.el6_9

red hat advisories RHSA-2018:0647RHSA-2018:0648RHSA-2018:0527RHSA-2018:0526

  • MozillaFirefox SLES for SAP 11 SP4, SLES 11 SP4, SLES 11 SP3-TERADATA +3 more 52.7.3esr-72.27.2
  • MozillaFirefox SLES for SAP 12 SP3, SLES for SAP 12 SP2, SLES for Raspberry Pi 12 SP2 +6 more 52.7.3esr-109.25.1

suse advisories SUSE-SU-2018:0907-1SUSE-SU-2018:0850-1

  • 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 52.7-57.1

opensuse advisories openSUSE-SU-2024:14572-1openSUSE-SU-2024:10600-1openSUSE-SU-2024:10601-1openSUSE-SU-2018:0818-1openSUSE-SU-2018:0819-1

  • thunderbird Arch Linux 52.7.0-1

arch linux advisories AVG-663

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-2018-5125 updated cvss 8.8

Mozilla: Memory safety bugs fixed in Firefox 59 and Firefox ESR 52.7 (MFSA 2018-07)

  • Red Hat Enterprise Linux Client (v. 7) firefox 52.7.0-1.el7_4, thunderbird 52.7.0-1.el7_4 Red Hat Enterprise Linux Client Optional (v. 7) firefox 52.7.0-1.el7_4
    fixed: vendor fix RHSA-2018:0527
  • Red Hat Enterprise Linux Desktop (v. 6) firefox 52.7.0-1.el6_9, thunderbird 52.7.0-1.el6_9 Red Hat Enterprise Linux Desktop Optional (v. 6) firefox 52.7.0-1.el6_9
    fixed: vendor fix RHSA-2018:0526
  • Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) firefox 52.7.0-1.el7_4
    fixed: vendor fix RHSA-2018:0527
  • Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) thunderbird 52.7.0-1.el7_4
    fixed: vendor fix RHSA-2018:0648
  • Red Hat Enterprise Linux HPC Node Optional (v. 6) firefox 52.7.0-1.el6_9 Red Hat Enterprise Linux Server (v. 6) firefox 52.7.0-1.el6_9
    fixed: vendor fix RHSA-2018:0526
  • Red Hat Enterprise Linux Server (v. 7) firefox 52.7.0-1.el7_4
    fixed: vendor fix RHSA-2018:0527
  • Red Hat Enterprise Linux Server Optional (v. 6) firefox 52.7.0-1.el6_9, thunderbird 52.7.0-1.el6_9
    fixed: vendor fix RHSA-2018:0526
  • Red Hat Enterprise Linux Server Optional (v. 7) firefox 52.7.0-1.el7_4, thunderbird 52.7.0-1.el7_4
    fixed: vendor fix RHSA-2018:0527
show 4 more
  • Red Hat Enterprise Linux Workstation (v. 6) firefox 52.7.0-1.el6_9, thunderbird 52.7.0-1.el6_9
    fixed: vendor fix RHSA-2018:0526
  • Red Hat Enterprise Linux Workstation (v. 7) firefox 52.7.0-1.el7_4, thunderbird 52.7.0-1.el7_4
    fixed: vendor fix RHSA-2018:0527
  • Red Hat Enterprise Linux Workstation Optional (v. 6) firefox 52.7.0-1.el6_9
    fixed: vendor fix RHSA-2018:0526
  • Red Hat Enterprise Linux Workstation Optional (v. 7) firefox 52.7.0-1.el7_4
    fixed: vendor fix RHSA-2018:0527

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

2.48% chance of exploitation in the next 30 days, higher than 84% 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 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.