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Fencer Intel
high 8.8

CVE-2019-9813 json

Incorrect handling of __proto__ mutations may lead to type confusion in IonMonkey JIT code and can be leveraged for arbitrary memory read a…

published 7y ago modified 4mo ago also EUVD-2019-19175

cvss
8.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
6.7%
EPSS 6.7% chance of exploitation in 30 days, percentile 94%
public exploits
1
Exploit-DB

Summary

Incorrect handling of __proto__ mutations may lead to type confusion in IonMonkey JIT code and can be leveraged for arbitrary memory read and write. This vulnerability affects Firefox < 66.0.1, Firefox ESR < 60.6.1, and Thunderbird < 60.6.1.

Patch / fix

  • Mozilla Firefox 66.0.1
  • Mozilla Firefox ESR 60.6.1
  • Mozilla Thunderbird 60.6.1
  • firefox-esr Debian 14, Debian 13, Debian 12 60.6.1esr-1

debian advisories DEBIAN-CVE-2019-9813

  • firefox Ubuntu 14.04 LTS 66.0.1+build1-0ubuntu0.14.04.1
  • firefox Ubuntu 16.04 LTS 66.0.1+build1-0ubuntu0.16.04.1
  • firefox Ubuntu 18.04 LTS 66.0.1+build1-0ubuntu0.18.04.1
  • thunderbird Ubuntu 14.04 LTS 1:60.6.1+build2-0ubuntu0.14.04.1
  • thunderbird Ubuntu 16.04 LTS 1:60.6.1+build2-0ubuntu0.16.04.1
  • thunderbird Ubuntu 18.04 LTS 1:60.6.1+build2-0ubuntu0.18.04.1

ubuntu advisories UBUNTU-CVE-2019-9813

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 60.6.1-1.el8
  • firefox RHEL 7 60.6.1-1.el7_6
  • firefox RHEL 6 60.6.1-1.el6_10
  • thunderbird RHEL 7 60.6.1-1.el7_6
  • firefox RHEL 8 60.6.1-1.el8
  • thunderbird RHEL 6 60.6.1-1.el6_10

red hat advisories RHSA-2019:1144RHSA-2019:0671RHSA-2019:0672RHSA-2019:0681RHSA-2019:0966RHSA-2019:0680

  • MozillaFirefox SLE Module for Desktop Applications 15 60.6.1-3.29.3
  • MozillaThunderbird SLE Workstation Extension 15 60.6.1-3.28.1
  • MozillaFirefox SLES for SAP 12 SP4, SLES for SAP 12 SP3, SLES for SAP 12 SP2 +13 more 60.6.1esr-109.63.2

suse advisories SUSE-SU-2019:0871-1SUSE-SU-2019:0853-1SUSE-SU-2019:0852-1

  • 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 openSUSE Leap 15.0 60.6.1-lp150.3.37.1
  • MozillaThunderbird Package Hub 12 60.6.1-82.1
  • MozillaFirefox openSUSE Leap 15.0 60.6.1-lp150.3.45.1

opensuse advisories openSUSE-SU-2024:14572-1openSUSE-SU-2024:10600-1openSUSE-SU-2024:10601-1openSUSE-SU-2019:1162-1openSUSE-SU-2019:1126-1openSUSE-SU-2019:1077-1

  • firefox-esr Alpine 3.23, Alpine 3.22, Alpine 3.21 +12 more 60.6.1-r0

alpine advisories ALPINE-CVE-2019-9813

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 66.0.1-1
  • thunderbird Arch Linux 60.6.1-1

arch linux advisories AVG-930AVG-947

Is CVE-2019-9813 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-2019-9813 updated cvss 8.8

Mozilla: Ionmonkey type confusion with __proto__ mutations

  • Red Hat Enterprise Linux AppStream (v. 8) firefox 60.6.1-1.el8, thunderbird 60.6.1-1.el8
    fixed: vendor fix RHSA-2019:0966
  • Red Hat Enterprise Linux Client (v. 7) firefox 60.6.1-1.el7_6, thunderbird 60.6.1-1.el7_6 Red Hat Enterprise Linux Client Optional (v. 7) firefox 60.6.1-1.el7_6
    fixed: vendor fix RHSA-2019:0671
  • Red Hat Enterprise Linux Desktop (v. 6) firefox 60.6.1-1.el6_10, thunderbird 60.6.1-1.el6_10 Red Hat Enterprise Linux Desktop Optional (v. 6) firefox 60.6.1-1.el6_10
    fixed: vendor fix RHSA-2019:0672
  • Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) firefox 60.6.1-1.el7_6
    fixed: vendor fix RHSA-2019:0671
  • Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) thunderbird 60.6.1-1.el7_6
    fixed: vendor fix RHSA-2019:0681
  • Red Hat Enterprise Linux HPC Node Optional (v. 6) firefox 60.6.1-1.el6_10 Red Hat Enterprise Linux Server (v. 6) firefox 60.6.1-1.el6_10
    fixed: vendor fix RHSA-2019:0672
  • Red Hat Enterprise Linux Server (v. 7) firefox 60.6.1-1.el7_6
    fixed: vendor fix RHSA-2019:0671
  • Red Hat Enterprise Linux Server Optional (v. 6) firefox 60.6.1-1.el6_10, thunderbird 60.6.1-1.el6_10
    fixed: vendor fix RHSA-2019:0672
show 5 more
  • Red Hat Enterprise Linux Server Optional (v. 7) firefox 60.6.1-1.el7_6, thunderbird 60.6.1-1.el7_6
    fixed: vendor fix RHSA-2019:0671
  • Red Hat Enterprise Linux Workstation (v. 6) firefox 60.6.1-1.el6_10, thunderbird 60.6.1-1.el6_10
    fixed: vendor fix RHSA-2019:0672
  • Red Hat Enterprise Linux Workstation (v. 7) firefox 60.6.1-1.el7_6, thunderbird 60.6.1-1.el7_6
    fixed: vendor fix RHSA-2019:0671
  • Red Hat Enterprise Linux Workstation Optional (v. 6) firefox 60.6.1-1.el6_10
    fixed: vendor fix RHSA-2019:0672
  • Red Hat Enterprise Linux Workstation Optional (v. 7) firefox 60.6.1-1.el7_6
    fixed: vendor fix RHSA-2019:0671

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

  1. First public exploit (EDB-46646)
  2. Published

Exploit prediction

6.75% chance of exploitation in the next 30 days, higher than 94% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • EDB-46646 SpiderMonkey - IonMonkey Compiled Code Fails to Update Inferred Property Types (Type Confusion) dos, 2019-04-03

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 Firefox
  • Mozilla Firefox ESR
  • Mozilla Thunderbird

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.