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TI-2022-19505 Aliases CVE-2022-40962GHSA-wcx8-5vxf-rv69

Out-of-bounds write in Mozilla Firefox ESR

Priority MEDIUM 43CWE-787Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 11 fixed, 1 without a fix

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

Summary

Mozilla developers Nika Layzell, Timothy Nikkel, Sebastian Hengst, Andreas Pehrson, and the Mozilla Fuzzing Team reported memory safety bugs present in Firefox 104 and Firefox ESR 102.2. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox ESR < 102.3, Thunderbird < 102.3, and Firefox < 105.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0143 73rd percentileScored 2026-11-07
Fix Partial Firefox ESR (Mozilla): 102.3Thunderbird (Mozilla): 102.3+1 more productRed Hat: 12 advisoriesRed Hat: 11 fixed, 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
MozillaFirefox ESRbefore 102.3102.3Patch availableCNA
MozillaThunderbirdbefore 102.3102.3Patch availableCNA
MozillaFirefoxbefore 105105Patch availableCNA
  • Firefox ESR VendorMozilla Affected before 102.3 Fixed in 102.3 Patch available CNA
  • Thunderbird VendorMozilla Affected before 102.3 Fixed in 102.3 Patch available CNA
  • Firefox VendorMozilla Affected before 105 Fixed in 105 Patch available CNA

CPE configurations NVD · 3

CPEVersionsRoleVendor
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*before 105.0VulnerableMozilla
cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*before 102.3VulnerableMozilla
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*before 102.3VulnerableMozilla
  • cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* Versions before 105.0 Vulnerable ·Mozilla
  • cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:* Versions before 102.3 Vulnerable ·Mozilla
  • cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* Versions before 102.3 Vulnerable ·Mozilla

Remediation

  • Fix · CNA Firefox ESR (Mozilla) Fixed in 102.3
  • Fix · CNA Thunderbird (Mozilla) Fixed in 102.3
  • Fix · CNA Firefox (Mozilla) Fixed in 105

Red Hat 12 advisories

  • RHSA-2022:6717 Released 2022-09-26 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream (v. 9) thunderbird-102.3.0-3.el9_0
  • RHSA-2022:6715 Released 2022-09-26 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream EUS (v. 8.2) thunderbird-102.3.0-3.el8_2
  • RHSA-2022:6716 Released 2022-09-26 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream E4S (v. 8.1) thunderbird-102.3.0-3.el8_1
Show 9 more Red Hat advisories
  • RHSA-2022:6708 Released 2022-09-26 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream (v. 8) thunderbird-102.3.0-3.el8_6
  • RHSA-2022:6711 Released 2022-09-26 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux Client (v. 7) firefox-102.3.0-6.el7_9
    • Red Hat Enterprise Linux Client Optional (v. 7) firefox-102.3.0-6.el7_9
    • Red Hat Enterprise Linux Server (v. 7) firefox-102.3.0-6.el7_9
    • Red Hat Enterprise Linux Server Optional (v. 7) firefox-102.3.0-6.el7_9
    • Red Hat Enterprise Linux Workstation (v. 7) firefox-102.3.0-6.el7_9
    • Red Hat Enterprise Linux Workstation Optional (v. 7) firefox-102.3.0-6.el7_9
  • RHSA-2022:6710 Released 2022-09-26 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux Client (v. 7) thunderbird-102.3.0-3.el7_9
    • Red Hat Enterprise Linux Server Optional (v. 7) thunderbird-102.3.0-3.el7_9
    • Red Hat Enterprise Linux Workstation (v. 7) thunderbird-102.3.0-3.el7_9
  • RHSA-2022:6707 Released 2022-09-26 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream EUS (v. 8.2) firefox-102.3.0-6.el8_2
  • RHSA-2022:6713 Released 2022-09-26 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream EUS (v.8.4) thunderbird-102.3.0-3.el8_4
  • RHSA-2022:6702 Released 2022-09-26 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream (v. 8) firefox-102.3.0-6.el8_6
  • RHSA-2022:6700 Released 2022-09-26 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream (v. 9) firefox-102.3.0-6.el9_0
  • RHSA-2022:6701 Released 2022-09-26 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream EUS (v.8.4) firefox-102.3.0-6.el8_4
  • RHSA-2022:6703 Released 2022-09-26 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream E4S (v. 8.1) firefox-102.3.0-6.el8_1

Fixed in the same release

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

  • Release ·

    Mozilla Thunderbird 102.3

    8 records Highest priority Priority MEDIUM 2 MEDIUM, 6 LOW

    Other records, highest priority first

    • TI-2022-03017 Out-of-bounds read in Mozilla Firefox ESRPriority MEDIUM 58
    • TI-2022-02914 Incorrect default permissions in Mozilla ThunderbirdPriority LOW 35
    • TI-2022-19502 Insecure storage of sensitive information in Mozilla Firefox ESRPriority LOW 32
    Show all 8 records →
  • Release ·

    Mozilla Firefox 105

    8 records Highest priority Priority MEDIUM 2 MEDIUM, 6 LOW

    Other records, highest priority first

    • TI-2022-03017 Out-of-bounds read in Mozilla Firefox ESRPriority MEDIUM 58
    • TI-2022-19502 Insecure storage of sensitive information in Mozilla Firefox ESRPriority LOW 32
    • TI-2022-19503 Use after free in Mozilla Firefox ESRPriority LOW 31
    Show all 8 records →
Show 1 more group
  • Release ·

    Mozilla Firefox ESR 102.3

    7 records Highest priority Priority MEDIUM 2 MEDIUM, 5 LOW

    Other records, highest priority first

    • TI-2022-03017 Out-of-bounds read in Mozilla Firefox ESRPriority MEDIUM 58
    • TI-2022-19502 Insecure storage of sensitive information in Mozilla Firefox ESRPriority LOW 32
    • TI-2022-19503 Use after free in Mozilla Firefox ESRPriority LOW 31
    Show all 7 records →

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat Enterprise Linux 6AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2022:6702, RHSA-2022:6708
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2022:6700, RHSA-2022:6717
Red Hat Enterprise Linux AppStream E4S (v. 8.1)Fixed RHSA-2022:6703, RHSA-2022:6716
Red Hat Enterprise Linux AppStream EUS (v. 8.2)Fixed RHSA-2022:6707, RHSA-2022:6715
Red Hat Enterprise Linux AppStream EUS (v.8.4)Fixed RHSA-2022:6701, RHSA-2022:6713
Red Hat Enterprise Linux Client (v. 7)Fixed RHSA-2022:6710, RHSA-2022:6711
Red Hat Enterprise Linux Client Optional (v. 7)Fixed RHSA-2022:6711
Red Hat Enterprise Linux Server (v. 7)Fixed RHSA-2022:6711
Red Hat Enterprise Linux Server Optional (v. 7)Fixed RHSA-2022:6710, RHSA-2022:6711
Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2022:6710, RHSA-2022:6711
Red Hat Enterprise Linux Workstation Optional (v. 7)Fixed RHSA-2022:6711

Timeline

  1. 2026-10-02 Threatist record created from CVE-2022-40962
  2. 2026-10-03 Alias added: GHSA-wcx8-5vxf-rv69

References

Advisory 3

Other 1

  • 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