high 8.8

CVE-2019-11707 kev in the critical feed json

A type confusion vulnerability can occur when manipulating JavaScript objects due to issues in Array.pop.

published 2019-07-23 7y ago modified 2026-06-17 4mo ago also EUVD-2019-3377

cvss: 8.8; version 3.1, CNA
cisa kev: Exploited; added 2022-05-23
epss: 38.0%; EPSS 38.0% chance of exploitation in 30 days, percentile 98%
public exploits: 2; Exploit-DB

A type confusion vulnerability can occur when manipulating JavaScript objects due to issues in Array.pop. This can allow for an exploitable crash. We are aware of targeted attacks in the wild abusing this flaw. This vulnerability affects Firefox ESR < 60.7.1, Firefox < 67.0.3, and Thunderbird < 60.7.2.

Patch / fix

cisa required action Apply updates per vendor instructions.

fixed in 3 distros 7

Mozilla Firefox ESR 60.7.1
Mozilla Firefox 67.0.3
Mozilla Thunderbird 60.7.2

debian ubuntu red hat suse opensuse alpine arch linux

firefox-esr Debian 14, Debian 13, Debian 12 60.7.1esr-1
thunderbird Debian 14, Debian 13, Debian 12 1:60.7.2-1

debian advisories DEBIAN-CVE-2019-11707

firefox Ubuntu 16.04 LTS 67.0.3+build1-0ubuntu0.16.04.1
firefox Ubuntu 18.04 LTS 67.0.3+build1-0ubuntu0.18.04.1

ubuntu advisories UBUNTU-CVE-2019-11707

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 60.7.2-2.el8_0
thunderbird RHEL 7 60.7.2-2.el7_6
thunderbird RHEL 6 60.7.2-2.el6_10
firefox RHEL 6 60.7.2-1.el6_10
firefox RHEL 7 60.7.2-1.el7_6
firefox RHEL 8 60.7.2-3.el8_0

red hat advisories RHSA-2019:1623 RHSA-2019:1626 RHSA-2019:1624 RHSA-2019:1604 RHSA-2019:1603 RHSA-2019:1696

MozillaThunderbird SLE Workstation Extension 15 SP1, SLE Workstation Extension 15 60.7.2-3.43.1
MozillaFirefox SLE Module for Desktop Applications 15 SP1, SLE Module for Desktop Applications 15 60.7.1-3.45.1
MozillaFirefox SLES for SAP 12 SP4, SLES for SAP 12 SP3, SLES for SAP 12 SP2 +13 more 60.7.1-109.77.1
MozillaFirefox SLES 11 SP4-LTSS 60.8.0esr-78.43.2

suse advisories SUSE-SU-2019:14124-1 SUSE-SU-2019:1683-1 SUSE-SU-2019:1629-1 SUSE-RU-2019:1625-1

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
MozillaThunderbird openSUSE Leap 15.1, openSUSE Leap 15.0 60.7.2-lp151.2.7.1
MozillaFirefox openSUSE Leap 15.0 60.7.2-lp150.3.59.1

opensuse advisories openSUSE-SU-2024:14572-1 openSUSE-SU-2024:10600-1 openSUSE-SU-2024:10601-1 openSUSE-SU-2019:1664-1 openSUSE-SU-2019:1606-1 openSUSE-SU-2019:1593-1

mozjs60 Alpine 3.12, Alpine 3.11, Alpine 3.10 60.7.2-r0
mozjs68 Alpine 3.12 60.7.2-r0
firefox-esr Alpine 3.23, Alpine 3.22, Alpine 3.21 +12 more 60.7.1-r0

alpine advisories ALPINE-CVE-2019-11707

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 67.0.3-1
firefox-developer-edition Arch Linux 68.0b11-1

arch linux advisories AVG-994 AVG-995

Is CVE-2019-11707 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

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-2019-11707 updated 2026-11-04 cvss 8.8

Mozilla: Type confusion in Array.pop

Red Hat Enterprise Linux AppStream (v. 8) firefox 60.7.2-3.el8_0, thunderbird 60.7.2-2.el8_0
fixed: vendor fix RHSA-2019:1696
Red Hat Enterprise Linux Client (v. 7) firefox 60.7.2-1.el7_6, thunderbird 60.7.2-2.el7_6 Red Hat Enterprise Linux Client Optional (v. 7) firefox 60.7.2-1.el7_6
fixed: vendor fix RHSA-2019:1603
Red Hat Enterprise Linux Desktop (v. 6) firefox 60.7.2-1.el6_10, thunderbird 60.7.2-2.el6_10 Red Hat Enterprise Linux Desktop Optional (v. 6) firefox 60.7.2-1.el6_10
fixed: vendor fix RHSA-2019:1604
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) firefox 60.7.2-1.el7_6
fixed: vendor fix RHSA-2019:1603
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) thunderbird 60.7.2-2.el7_6
fixed: vendor fix RHSA-2019:1626
Red Hat Enterprise Linux HPC Node Optional (v. 6) firefox 60.7.2-1.el6_10 Red Hat Enterprise Linux Server (v. 6) firefox 60.7.2-1.el6_10
fixed: vendor fix RHSA-2019:1604
Red Hat Enterprise Linux Server (v. 7) firefox 60.7.2-1.el7_6
fixed: vendor fix RHSA-2019:1603
Red Hat Enterprise Linux Server Optional (v. 6) firefox 60.7.2-1.el6_10, thunderbird 60.7.2-2.el6_10
fixed: vendor fix RHSA-2019:1604

show 5 more

Red Hat Enterprise Linux Server Optional (v. 7) firefox 60.7.2-1.el7_6, thunderbird 60.7.2-2.el7_6
fixed: vendor fix RHSA-2019:1603
Red Hat Enterprise Linux Workstation (v. 6) firefox 60.7.2-1.el6_10, thunderbird 60.7.2-2.el6_10
fixed: vendor fix RHSA-2019:1604
Red Hat Enterprise Linux Workstation (v. 7) firefox 60.7.2-1.el7_6, thunderbird 60.7.2-2.el7_6
fixed: vendor fix RHSA-2019:1603
Red Hat Enterprise Linux Workstation Optional (v. 6) firefox 60.7.2-1.el6_10
fixed: vendor fix RHSA-2019:1604
Red Hat Enterprise Linux Workstation Optional (v. 7) firefox 60.7.2-1.el7_6
fixed: vendor fix RHSA-2019:1603

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

Timeline

2019-06-18 0-day patched (Project Zero)
2019-06-26 First public exploit (EDB-47038)
2019-07-23 Published
2022-05-23 Added to CISA KEV
2022-06-13 CISA patch deadline
2025-02-07 CISA SSVC: exploitation active

Known exploited

Added: 4y ago (2022-05-23)
Patch by: 2022-06-13 (4y ago)
Ransomware: Not known
Required action: Apply updates per vendor instructions.
Vendor, product: Mozilla, Firefox and Thunderbird
CISA name: Mozilla Firefox and Thunderbird Type Confusion Vulnerability

Zero-day

Detected in real attacks while still unknown to the vendor and the public, per Google Project Zero's 0day In-the-Wild tracker.

Patched: 2019-06-18
Details: project zero root cause analysis

CISA SSVC

Exploitation: Active, exploited in the wild
Automatable: no
Technical impact: total
Assessed: last yr. (2025-02-07)

Exploit prediction

37.95% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

EDB-50691 Mozilla Firefox 67 - Array.pop JIT Type Confusion local, 2022-02-02
EDB-47038 Mozilla Spidermonkey - IonMonkey 'Array.prototype.pop' Type Confusion dos, 2019-06-26

CVSS scores

assigned by	version	score	vector
CISA ADP	3.1	8.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD	3.1	8.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CNA	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	7.5	AV:N/AC:L/Au:N/C:P/I:P/A:P

Affected products

Mozilla Firefox ESR
Mozilla Firefox
Mozilla Thunderbird

Classification

Weakness

CWE-843 Access of Resource Using Incompatible Type

References

security.gentoo.org /glsa/201908-12
vendor-advisory, third-party-advisory
mozilla.org /security/advisories/mfsa2019-20/
vendor-advisory
mozilla.org /security/advisories/mfsa2019-18/
vendor-advisory
bugzilla.mozilla.org /show_bug.cgi?id=1544386
issue-tracking, permissions-required, vendor-advisory
cisa.gov /known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-11707
government-resource, us-government-resource

Sources

CVE List CVE-2019-11707
NVD CVE-2019-11707

Fencer Intel 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.