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Fencer Vulns
critical 9.8

CVE-2019-9800 json

Mozilla developers and community members reported memory safety bugs present in Firefox 66, Firefox ESR 60.6, and Thunderbird 60.6.

published 2019-07-23 7 y ago modified 2026-06-17 4 mo ago also EUVD-2019-19162

cvss
9.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.7%
EPSS 1.7% chance of exploitation in 30 days, percentile 77%
public exploits
0
none known

Summary

Mozilla developers and community members reported memory safety bugs present in Firefox 66, Firefox ESR 60.6, and Thunderbird 60.6. 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 < 60.7, Firefox < 67, and Firefox ESR < 60.7.

Patch / fix

  • Mozilla Thunderbird 60.7
  • Mozilla Firefox 67
  • Mozilla Firefox ESR 60.7
  • firefox-esr Debian 14, Debian 13, Debian 12 60.7.0esr-1
  • thunderbird Debian 14, Debian 13, Debian 12 1:60.7.0-1

debian advisories DEBIAN-CVE-2019-9800

  • firefox Ubuntu 16.04 LTS 67.0+build2-0ubuntu0.16.04.1
  • firefox Ubuntu 18.04 LTS 67.0+build2-0ubuntu0.18.04.1
  • thunderbird Ubuntu 16.04 LTS 1:60.7.0+build1-0ubuntu0.16.04.1
  • thunderbird Ubuntu 18.04 LTS 1:60.7.0+build1-0ubuntu0.18.04.1

ubuntu advisories UBUNTU-CVE-2019-9800

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 60.7.0-1.el6_10
  • thunderbird RHEL 7 60.7.0-1.el7_6
  • thunderbird RHEL 8 60.7.0-1.el8_0
  • firefox RHEL 6 60.7.0-1.el6_10
  • firefox RHEL 7 60.7.0-1.el7_6
  • firefox RHEL 8 60.7.0-1.el8_0

red hat advisories RHSA-2019:1310RHSA-2019:1309RHSA-2019:1308RHSA-2019:1267RHSA-2019:1265RHSA-2019:1269

  • MozillaThunderbird SLE Workstation Extension 15 SP1, SLE Workstation Extension 15 60.7.0-3.33.2
  • MozillaFirefox SLE Module for Desktop Applications 15 SP1, SLE Module for Desktop Applications 15 60.7.0-3.40.6
  • MozillaFirefox SLES for SAP 12 SP4, SLES for SAP 12 SP3, SLES for SAP 12 SP2 +13 more 60.7.0-109.72.1

suse advisories SUSE-SU-2019:1458-1SUSE-SU-2019:1405-1SUSE-SU-2019:1388-1

  • 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 60.7.2-85.1
  • MozillaFirefox openSUSE Leap 15.0 60.7.0-lp150.3.54.5

opensuse advisories openSUSE-SU-2024:14572-1openSUSE-SU-2024:10600-1openSUSE-SU-2024:10601-1openSUSE-SU-2019:1664-1openSUSE-SU-2019:1534-1

  • firefox-esr Alpine 3.23, Alpine 3.22, Alpine 3.21 +12 more 60.7.0-r0

alpine advisories ALPINE-CVE-2019-9800

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • thunderbird Arch Linux 60.7.0-1
  • firefox Arch Linux 67.0-1

arch linux advisories AVG-965AVG-966

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-2019-9800 updated cvss 9.8

Mozilla: Memory safety bugs fixed in Firefox 67 and Firefox ESR 60.7

  • Red Hat Enterprise Linux AppStream (v. 8) firefox 60.7.0-1.el8_0, thunderbird 60.7.0-1.el8_0
    fixed: vendor fix RHSA-2019:1269
  • Red Hat Enterprise Linux Client (v. 7) firefox 60.7.0-1.el7_6, thunderbird 60.7.0-1.el7_6 Red Hat Enterprise Linux Client Optional (v. 7) firefox 60.7.0-1.el7_6
    fixed: vendor fix RHSA-2019:1265
  • Red Hat Enterprise Linux Desktop (v. 6) firefox 60.7.0-1.el6_10, thunderbird 60.7.0-1.el6_10 Red Hat Enterprise Linux Desktop Optional (v. 6) firefox 60.7.0-1.el6_10
    fixed: vendor fix RHSA-2019:1267
  • Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) firefox 60.7.0-1.el7_6
    fixed: vendor fix RHSA-2019:1265
  • Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) thunderbird 60.7.0-1.el7_6
    fixed: vendor fix RHSA-2019:1309
  • Red Hat Enterprise Linux HPC Node Optional (v. 6) firefox 60.7.0-1.el6_10 Red Hat Enterprise Linux Server (v. 6) firefox 60.7.0-1.el6_10
    fixed: vendor fix RHSA-2019:1267
  • Red Hat Enterprise Linux Server (v. 7) firefox 60.7.0-1.el7_6
    fixed: vendor fix RHSA-2019:1265
  • Red Hat Enterprise Linux Server Optional (v. 6) firefox 60.7.0-1.el6_10, thunderbird 60.7.0-1.el6_10
    fixed: vendor fix RHSA-2019:1267
show 5 more
  • Red Hat Enterprise Linux Server Optional (v. 7) firefox 60.7.0-1.el7_6, thunderbird 60.7.0-1.el7_6
    fixed: vendor fix RHSA-2019:1265
  • Red Hat Enterprise Linux Workstation (v. 6) firefox 60.7.0-1.el6_10, thunderbird 60.7.0-1.el6_10
    fixed: vendor fix RHSA-2019:1267
  • Red Hat Enterprise Linux Workstation (v. 7) firefox 60.7.0-1.el7_6, thunderbird 60.7.0-1.el7_6
    fixed: vendor fix RHSA-2019:1265
  • Red Hat Enterprise Linux Workstation Optional (v. 6) firefox 60.7.0-1.el6_10
    fixed: vendor fix RHSA-2019:1267
  • Red Hat Enterprise Linux Workstation Optional (v. 7) firefox 60.7.0-1.el7_6
    fixed: vendor fix RHSA-2019:1265

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

1.73% chance of exploitation in the next 30 days, higher than 77% 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
  • Mozilla Firefox ESR

Classification

Weakness

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.