high 8.8

CVE-2019-11740 json

Mozilla developers and community members reported memory safety bugs present in Firefox 68, Firefox ESR 68, and Firefox 60.8.

published 2019-09-27 7 y ago modified 2026-06-17 4 mo ago also EUVD-2019-3410

cvss: 8.8; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.6%; EPSS 1.6% chance of exploitation in 30 days, percentile 76%
public exploits: 0; none known

Mozilla developers and community members reported memory safety bugs present in Firefox 68, Firefox ESR 68, and Firefox 60.8. 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 Firefox < 69, Thunderbird < 68.1, Thunderbird < 60.9, Firefox ESR < 60.9, and Firefox ESR < 68.1.

Patch / fix

fixed in 3 distros 7

Mozilla Firefox 69
Mozilla Thunderbird 60.9, 68.1
Mozilla Firefox ESR 60.9, 68.1

debian ubuntu red hat suse opensuse alpine arch linux

firefox-esr Debian 14, Debian 13, Debian 12 68.1.0esr-1
thunderbird Debian 14, Debian 13, Debian 12 1:60.9.0-1

debian advisories DEBIAN-CVE-2019-11740

firefox Ubuntu 16.04 LTS 69.0+build2-0ubuntu0.16.04.4
firefox Ubuntu 18.04 LTS 69.0+build2-0ubuntu0.18.04.1
thunderbird Ubuntu 16.04 LTS 1:60.9.0+build1-0ubuntu0.16.04.2
thunderbird Ubuntu 18.04 LTS 1:60.9.0+build1-0ubuntu0.18.04.1

ubuntu advisories UBUNTU-CVE-2019-11740

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 8 60.9.0-2.el8_0
thunderbird RHEL 7 60.9.0-1.el7_7
thunderbird RHEL 6 60.9.0-1.el6_10
firefox RHEL 7 60.9.0-1.el7_7
firefox RHEL 6 60.9.0-1.el6_10
firefox RHEL 8 68.1.0-1.el8_0

red hat advisories RHSA-2019:2774 RHSA-2019:2773 RHSA-2019:2807 RHSA-2019:2729 RHSA-2019:2694 RHSA-2019:2663

MozillaFirefox SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES for SAP 12 SP3 +18 more 68.1.0-109.89.1
MozillaFirefox-branding-SLE SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES for SAP 12 SP3 +16 more 68-32.8.1
MozillaFirefox SLE Module for Desktop Applications 15 SP1, SLE Module for Desktop Applications 15 68.1.0-3.54.2
MozillaFirefox-branding-SLE SLE Module for Desktop Applications 15 SP1, SLE Module for Desktop Applications 15 68-4.8.5
MozillaThunderbird SLE Workstation Extension 15 SP1, SLE Workstation Extension 15 68.1.1-3.51.1
MozillaFirefox SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES for SAP 12 SP3 +18 more 60.9.0-109.86.1
firefox-atk SLES 11 SP4-LTSS 2.26.1-2.8.4
mozilla-nss SLES 11 SP4-LTSS 3.45-38.9.3

suse advisories SUSE-SU-2019:14246-1 SUSE-SU-2019:2620-1 SUSE-SU-2019:2545-1 SUSE-SU-2019:2515-1 SUSE-SU-2019:2436-1 SUSE-SU-2019:14173-1

firefox-esr openSUSE Tumbleweed 128.5.1-1.1
MozillaFirefox openSUSE Tumbleweed 92.0-1.2
MozillaThunderbird openSUSE Tumbleweed 91.1.1-1.1
MozillaFirefox openSUSE Leap 15.0 68.1.0-lp150.3.66.1
MozillaFirefox openSUSE Leap 15.1 68.1.0-lp151.2.14.1
MozillaThunderbird openSUSE Leap 15.1 68.1.1-lp151.2.13.1
enigmail openSUSE Leap 15.1 2.1.2-lp151.2.6.1
MozillaThunderbird openSUSE Leap 15.0 68.1.1-lp150.3.51.1

opensuse advisories openSUSE-SU-2024:14572-1 openSUSE-SU-2024:10600-1 openSUSE-SU-2024:10601-1 openSUSE-SU-2019:2260-1 openSUSE-SU-2019:2251-1 openSUSE-SU-2019:2249-1

firefox-esr Alpine 3.10, Alpine 3.9 69.9.0-r0
firefox-esr Alpine 3.23, Alpine 3.22, Alpine 3.21 +10 more 68.1.0-r0

alpine advisories ALPINE-CVE-2019-11740

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

firefox Arch Linux 69.0-1

arch linux advisories AVG-1036

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-2019-11740 updated 2026-11-04 cvss 9.8

Mozilla: Memory safety bugs fixed in Firefox 69, Firefox ESR 68.1, Firefox ESR 60.9, Thunderbird 68.1, and Thunderbird 60.9

Red Hat Enterprise Linux 5 firefox, thunderbird
affected: no fix planned “Out of support scope”
Red Hat Enterprise Linux AppStream (v. 8) firefox 68.1.0-1.el8_0, thunderbird 60.9.0-2.el8_0
fixed: vendor fix RHSA-2019:2663
Red Hat Enterprise Linux Client (v. 7) firefox 60.9.0-1.el7_7, thunderbird 60.9.0-1.el7_7 Red Hat Enterprise Linux Client Optional (v. 7) firefox 60.9.0-1.el7_7
fixed: vendor fix RHSA-2019:2729
Red Hat Enterprise Linux Desktop (v. 6) firefox 60.9.0-1.el6_10, thunderbird 60.9.0-1.el6_10 Red Hat Enterprise Linux Desktop Optional (v. 6) firefox 60.9.0-1.el6_10 Red Hat Enterprise Linux HPC Node Optional (v. 6) firefox 60.9.0-1.el6_10 Red Hat Enterprise Linux Server (v. 6) firefox 60.9.0-1.el6_10
fixed: vendor fix RHSA-2019:2694
Red Hat Enterprise Linux Server (v. 7) firefox 60.9.0-1.el7_7
fixed: vendor fix RHSA-2019:2729
Red Hat Enterprise Linux Server Optional (v. 6) firefox 60.9.0-1.el6_10, thunderbird 60.9.0-1.el6_10
fixed: vendor fix RHSA-2019:2694
Red Hat Enterprise Linux Server Optional (v. 7) firefox 60.9.0-1.el7_7, thunderbird 60.9.0-1.el7_7
fixed: vendor fix RHSA-2019:2729
Red Hat Enterprise Linux Workstation (v. 6) firefox 60.9.0-1.el6_10, thunderbird 60.9.0-1.el6_10
fixed: vendor fix RHSA-2019:2694

show 3 more

Red Hat Enterprise Linux Workstation (v. 7) firefox 60.9.0-1.el7_7, thunderbird 60.9.0-1.el7_7
fixed: vendor fix RHSA-2019:2729
Red Hat Enterprise Linux Workstation Optional (v. 6) firefox 60.9.0-1.el6_10
fixed: vendor fix RHSA-2019:2694
Red Hat Enterprise Linux Workstation Optional (v. 7) firefox 60.9.0-1.el7_7
fixed: vendor fix RHSA-2019:2729

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

1.64% chance of exploitation in the next 30 days, higher than 76% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.1	8.8	CVSS:3.1/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
Mozilla Thunderbird
Mozilla Firefox ESR

Classification

Weakness

CWE-787 Out-of-bounds Write

References

lists.opensuse.org /opensuse-security-announce/2019-10/msg00010.html
vendor-advisory, mailing-list, third-party-advisory
lists.opensuse.org /opensuse-security-announce/2019-10/msg00009.html
vendor-advisory, mailing-list, third-party-advisory
lists.opensuse.org /opensuse-security-announce/2019-10/msg00011.html
vendor-advisory, mailing-list, third-party-advisory
lists.opensuse.org /opensuse-security-announce/2019-10/msg00017.html
vendor-advisory, mailing-list, third-party-advisory
usn.ubuntu.com /4150-1/
vendor-advisory, third-party-advisory
security.gentoo.org /glsa/201911-07
vendor-advisory, third-party-advisory
bugzilla.mozilla.org /buglist.cgi?bug_id=1563133%2C1573160
issue-tracking, not-applicable, vendor-advisory
mozilla.org /security/advisories/mfsa2019-25/
vendor-advisory
mozilla.org /security/advisories/mfsa2019-27/
vendor-advisory
mozilla.org /security/advisories/mfsa2019-26/
vendor-advisory
mozilla.org /security/advisories/mfsa2019-29/
vendor-advisory
mozilla.org /security/advisories/mfsa2019-30/
vendor-advisory

Sources

CVE List CVE-2019-11740
NVD CVE-2019-11740

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.

Summary