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Fencer Intel
critical 9.8

CVE-2019-9819 json

A vulnerability where a JavaScript compartment mismatch can occur while working with the fetch API, resulting in a potentially exploitable…

published 7y ago modified 4mo ago also EUVD-2019-19181

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

A vulnerability where a JavaScript compartment mismatch can occur while working with the fetch API, resulting in a potentially exploitable crash. 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-2019-9819

  • 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-2019-9819

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-2019-9819

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

Is CVE-2019-9819 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.

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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-2019-9819 updated cvss 9.8

Mozilla: Compartment mismatch with fetch API

  • 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

1.69% chance of exploitation in the next 30 days, higher than 77% of all scored CVEs (FIRST EPSS, 2026-11-09).

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
  • CWE-843 Access of Resource Using Incompatible Type

References

Sources

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.