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TI-2022-18099 Aliases CVE-2022-38477GHSA-79cc-3p55-rr77

Out-of-bounds write in Mozilla Firefox ESR

Priority MEDIUM 42CWE-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 developer Nika Layzell and the Mozilla Fuzzing Team reported memory safety bugs present in Firefox 103 and Firefox ESR 102.1. 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 < 102.2, Thunderbird < 102.2, and Firefox < 104.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00927 60th percentileScored 2026-11-07
Fix Partial Firefox ESR (Mozilla): 102.2Thunderbird (Mozilla): 102.2+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 102.2102.2Patch availableCNA
MozillaThunderbirdbefore 102.2102.2Patch availableCNA
MozillaFirefoxbefore 104104Patch availableCNA
  • Firefox ESR VendorMozilla Affected before 102.2 Fixed in 102.2 Patch available CNA
  • Thunderbird VendorMozilla Affected before 102.2 Fixed in 102.2 Patch available CNA
  • Firefox VendorMozilla Affected before 104 Fixed in 104 Patch available CNA

CPE configurations NVD · 3

CPEVersionsRoleVendor
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*before 104.0VulnerableMozilla
cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*before 102.2VulnerableMozilla
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*before 102.2VulnerableMozilla
  • cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* Versions before 104.0 Vulnerable ·Mozilla
  • cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:* Versions before 102.2 Vulnerable ·Mozilla
  • cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* Versions before 102.2 Vulnerable ·Mozilla

Remediation

  • Fix · CNA Firefox ESR (Mozilla) Fixed in 102.2
  • Fix · CNA Thunderbird (Mozilla) Fixed in 102.2
  • Fix · CNA Firefox (Mozilla) Fixed in 104

Red Hat 12 advisories

  • RHSA-2022:6179 Released 2022-08-24 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux Client (v. 7) firefox-91.13.0-1.el7_9
    • Red Hat Enterprise Linux Client Optional (v. 7) firefox-91.13.0-1.el7_9
    • Red Hat Enterprise Linux Server (v. 7) firefox-91.13.0-1.el7_9
    • Red Hat Enterprise Linux Server Optional (v. 7) firefox-91.13.0-1.el7_9
    • Red Hat Enterprise Linux Workstation (v. 7) firefox-91.13.0-1.el7_9
    • Red Hat Enterprise Linux Workstation Optional (v. 7) firefox-91.13.0-1.el7_9
  • RHSA-2022:6169 Released 2022-08-24 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux Client (v. 7) thunderbird-91.13.0-1.el7_9
    • Red Hat Enterprise Linux Server Optional (v. 7) thunderbird-91.13.0-1.el7_9
    • Red Hat Enterprise Linux Workstation (v. 7) thunderbird-91.13.0-1.el7_9
  • RHSA-2022:6177 Released 2022-08-24 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream EUS (v. 8.2) firefox-91.13.0-1.el8_2
Show 9 more Red Hat advisories
  • RHSA-2022:6164 Released 2022-08-24 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream (v. 8) thunderbird-91.13.0-1.el8_6
  • RHSA-2022:6175 Released 2022-08-24 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream (v. 8) firefox-91.13.0-1.el8_6
  • RHSA-2022:6174 Released 2022-08-24 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream (v. 9) firefox-91.13.0-1.el9_0
  • RHSA-2022:6178 Released 2022-08-24 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream E4S (v. 8.1) firefox-91.13.0-1.el8_1
  • RHSA-2022:6176 Released 2022-08-24 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream EUS (v.8.4) firefox-91.13.0-1.el8_4
  • RHSA-2022:6168 Released 2022-08-24 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream EUS (v. 8.2) thunderbird-91.13.0-1.el8_2
  • RHSA-2022:6167 Released 2022-08-24 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream E4S (v. 8.1) thunderbird-91.13.0-1.el8_1
  • RHSA-2022:6166 Released 2022-08-24 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream EUS (v.8.4) thunderbird-91.13.0-1.el8_4
  • RHSA-2022:6165 Released 2022-08-24 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream (v. 9) thunderbird-91.13.0-1.el9_0

Fixed in the same release

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

  • Release ·

    Mozilla Firefox 104

    6 records Highest priority Priority MEDIUM 3 MEDIUM, 3 LOW

    Other records, highest priority first

    • TI-2022-18100 Out-of-bounds write in Mozilla ThunderbirdPriority MEDIUM 42
    • TI-2022-18095 A cross-origin iframe referencing an XSLT document would inherit the parent domain's…Priority MEDIUM 41
    • TI-2022-18097 Incorrect authorization in Mozilla FirefoxPriority LOW 29
    Show all 6 records →
  • Release ·

    Mozilla Firefox ESR, Thunderbird 102.2

    2 records Highest priority Priority MEDIUM 1 MEDIUM, 1 LOW

    Other records, highest priority first

    • TI-2022-18098 Use after free in Mozilla Firefox ESRPriority LOW 36
    Show all 2 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-2022:6164, RHSA-2022:6175
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2022:6165, RHSA-2022:6174
Red Hat Enterprise Linux AppStream E4S (v. 8.1)Fixed RHSA-2022:6167, RHSA-2022:6178
Red Hat Enterprise Linux AppStream EUS (v. 8.2)Fixed RHSA-2022:6168, RHSA-2022:6177
Red Hat Enterprise Linux AppStream EUS (v.8.4)Fixed RHSA-2022:6166, RHSA-2022:6176
Red Hat Enterprise Linux Client (v. 7)Fixed RHSA-2022:6169, RHSA-2022:6179
Red Hat Enterprise Linux Client Optional (v. 7)Fixed RHSA-2022:6179
Red Hat Enterprise Linux Server (v. 7)Fixed RHSA-2022:6179
Red Hat Enterprise Linux Server Optional (v. 7)Fixed RHSA-2022:6169, RHSA-2022:6179
Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2022:6169, RHSA-2022:6179
Red Hat Enterprise Linux Workstation Optional (v. 7)Fixed RHSA-2022:6179

Timeline

  1. 2026-10-02 Threatist record created from CVE-2022-38477
  2. 2026-10-03 Alias added: GHSA-79cc-3p55-rr77

References

Advisory 4

  • 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