Read the docs
TI-2019-07178 Aliases CVE-2019-9792GHSA-83fw-4w4c-4v29

Out-of-bounds write in Mozilla Thunderbird

Priority MEDIUM 57CWE-787Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-787 and the CVSS impact.

Summary

The IonMonkey just-in-time (JIT) compiler can leak an internal JS_OPTIMIZED_OUT magic value to the running script during a bailout. This magic value can then be used by JavaScript to achieve memory corruption, which results in a potentially exploitable crash. This vulnerability affects Thunderbird < 60.6, Firefox ESR < 60.6, and Firefox < 66.

Why it matters now

EPSS 0.13303 96th percentileScored 2026-11-07
Public exploit Yes 2 exploit referencesTagged by NVD
Fix Fixed Thunderbird (Mozilla): 60.6Firefox ESR (Mozilla): 60.6+1 more productRed Hat: 6 advisories

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
MozillaThunderbirdbefore 60.660.6Patch availableCNA
MozillaFirefox ESRbefore 60.660.6Patch availableCNA
MozillaFirefoxbefore 6666Patch availableCNA
  • Thunderbird VendorMozilla Affected before 60.6 Fixed in 60.6 Patch available CNA
  • Firefox ESR VendorMozilla Affected before 60.6 Fixed in 60.6 Patch available CNA
  • Firefox VendorMozilla Affected before 66 Fixed in 66 Patch available CNA

CPE configurations NVD · 10

CPEVersionsRoleVendor
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*before 60.6.0; before 66.0VulnerableMozilla
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*before 60.6.0VulnerableMozilla
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*8.0VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_eus:8.1:*:*:*:*:*:*:*8.1VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_eus:8.2:*:*:*:*:*:*:*8.2VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_eus:8.4:*:*:*:*:*:*:*8.4VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_server_aus:8.2:*:*:*:*:*:*:*8.2VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_server_aus:8.4:*:*:*:*:*:*:*8.4VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_server_tus:8.2:*:*:*:*:*:*:*8.2VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_server_tus:8.4:*:*:*:*:*:*:*8.4VulnerableRed Hat
  • cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* Versions before 60.6.0; before 66.0 Vulnerable ·Mozilla
  • cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* Versions before 60.6.0 Vulnerable ·Mozilla
  • cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:* Versions 8.0 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_eus:8.1:*:*:*:*:*:*:* Versions 8.1 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_eus:8.2:*:*:*:*:*:*:* Versions 8.2 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_eus:8.4:*:*:*:*:*:*:* Versions 8.4 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_server_aus:8.2:*:*:*:*:*:*:* Versions 8.2 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_server_aus:8.4:*:*:*:*:*:*:* Versions 8.4 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_server_tus:8.2:*:*:*:*:*:*:* Versions 8.2 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_server_tus:8.4:*:*:*:*:*:*:* Versions 8.4 Vulnerable ·Red Hat

Remediation

  • Fix · CNA Thunderbird (Mozilla) Fixed in 60.6
  • Fix · CNA Firefox ESR (Mozilla) Fixed in 60.6
  • Fix · CNA Firefox (Mozilla) Fixed in 66

Red Hat 6 advisories

  • RHSA-2019:1144 Released 2019-05-13 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream (v. 8) thunderbird-60.6.1-1.el8
  • RHSA-2019:0966 Released 2019-05-07 · Red Hat rating Critical
    firefox security update
    • Red Hat Enterprise Linux AppStream (v. 8) firefox-60.6.1-1.el8
  • RHSA-2019:0681 Released 2019-03-28 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux Client (v. 7) thunderbird-60.6.1-1.el7_6
    • Red Hat Enterprise Linux Server Optional (v. 7) thunderbird-60.6.1-1.el7_6
    • Red Hat Enterprise Linux Workstation (v. 7) thunderbird-60.6.1-1.el7_6
    • Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) thunderbird-60.6.1-1.el7_6
Show 3 more Red Hat advisories
  • RHSA-2019:0680 Released 2019-03-28 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux Desktop (v. 6) thunderbird-60.6.1-1.el6_10
    • Red Hat Enterprise Linux Server Optional (v. 6) thunderbird-60.6.1-1.el6_10
    • Red Hat Enterprise Linux Workstation (v. 6) thunderbird-60.6.1-1.el6_10
  • RHSA-2019:0623 Released 2019-03-20 · Red Hat rating Critical
    firefox security update
    • Red Hat Enterprise Linux Desktop (v. 6) firefox-60.6.0-3.el6_10
    • Red Hat Enterprise Linux Desktop Optional (v. 6) firefox-60.6.0-3.el6_10
    • Red Hat Enterprise Linux HPC Node Optional (v. 6) firefox-60.6.0-3.el6_10
    • Red Hat Enterprise Linux Server (v. 6) firefox-60.6.0-3.el6_10
    • Red Hat Enterprise Linux Server Optional (v. 6) firefox-60.6.0-3.el6_10
    • Red Hat Enterprise Linux Workstation (v. 6) firefox-60.6.0-3.el6_10
    • Red Hat Enterprise Linux Workstation Optional (v. 6) firefox-60.6.0-3.el6_10
  • RHSA-2019:0622 Released 2019-03-20 · Red Hat rating Critical
    firefox security update
    • Red Hat Enterprise Linux Client (v. 7) firefox-60.6.0-3.el7_6
    • Red Hat Enterprise Linux Client Optional (v. 7) firefox-60.6.0-3.el7_6
    • Red Hat Enterprise Linux Server (v. 7) firefox-60.6.0-3.el7_6
    • Red Hat Enterprise Linux Server Optional (v. 7) firefox-60.6.0-3.el7_6
    • Red Hat Enterprise Linux Workstation (v. 7) firefox-60.6.0-3.el7_6
    • Red Hat Enterprise Linux Workstation Optional (v. 7) firefox-60.6.0-3.el7_6
    • Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) firefox-60.6.0-3.el7_6

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Mozilla Firefox 66

    21 records Highest priority Priority MEDIUM 10 MEDIUM, 11 LOW

    Other records, highest priority first

    • TI-2019-07177 Type confusion in Mozilla ThunderbirdPriority MEDIUM 61
    • TI-2019-07190 OS command injection in Mozilla FirefoxPriority MEDIUM 46
    • TI-2019-07182 Use after free in Mozilla ThunderbirdPriority MEDIUM 46
    Show all 21 records →
  • Release ·

    Mozilla Firefox ESR, Thunderbird 60.6

    9 records Highest priority Priority MEDIUM 7 MEDIUM, 2 LOW

    Other records, highest priority first

    • TI-2019-07177 Type confusion in Mozilla ThunderbirdPriority MEDIUM 61
    • TI-2019-07182 Use after free in Mozilla ThunderbirdPriority MEDIUM 46
    • TI-2019-07180 A vulnerability was discovered where specific command line arguments are not properly…Priority MEDIUM 46
    Show all 9 records →

Vendor assessments

Red Hat

Red Hat rating: Critical. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2019:0966, RHSA-2019:1144
Red Hat Enterprise Linux Client (v. 7)Fixed RHSA-2019:0622, RHSA-2019:0681
Red Hat Enterprise Linux Client Optional (v. 7)Fixed RHSA-2019:0622
Red Hat Enterprise Linux Desktop (v. 6)Fixed RHSA-2019:0623, RHSA-2019:0680
Red Hat Enterprise Linux Desktop Optional (v. 6)Fixed RHSA-2019:0623
Red Hat Enterprise Linux HPC Node Optional (v. 6)Fixed RHSA-2019:0623
Red Hat Enterprise Linux Server (v. 6)Fixed RHSA-2019:0623
Red Hat Enterprise Linux Server (v. 7)Fixed RHSA-2019:0622
Red Hat Enterprise Linux Server Optional (v. 6)Fixed RHSA-2019:0623, RHSA-2019:0680
Red Hat Enterprise Linux Server Optional (v. 7)Fixed RHSA-2019:0622, RHSA-2019:0681
Red Hat Enterprise Linux Workstation (v. 6)Fixed RHSA-2019:0623, RHSA-2019:0680
Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2019:0622, RHSA-2019:0681
Red Hat Enterprise Linux Workstation Optional (v. 6)Fixed RHSA-2019:0623
Red Hat Enterprise Linux Workstation Optional (v. 7)Fixed RHSA-2019:0622
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7)Fixed RHSA-2019:0622
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7)Fixed RHSA-2019:0681

Timeline

  1. 2026-10-02 Threatist record created from CVE-2019-9792
  2. 2026-10-03 Alias added: GHSA-83fw-4w4c-4v29

References

Exploit 2

Advisory 5

  • TI-2024-08981 Use after free in Mozilla Firefox KEVCVSS 3.1CRITICAL 9.8
  • TI-2022-09832 Use after free in Mozilla Firefox KEVCVSS 3.1CRITICAL 9.6
  • TI-2019-08769 Improper input validation in Mozilla Firefox ESR KEVCVSS 3.1CRITICAL 10.0
  • TI-2010-03577 Mozilla Firefox 3.5.x through 3.5.14 and 3.6.x through 3.6.11, Thunderbird 3.1.6 before… KEVCVSS 3.1CRITICAL 9.8
  • TI-2023-04799 Out-of-bounds write in Google Chrome KEVCVSS 3.1HIGH 8.8
  • TI-2023-04477 Out-of-bounds write in Google Chrome KEVCVSS 3.1HIGH 8.8
See all 3444 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences