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TI-2023-09434 Aliases CVE-2023-23605GHSA-w9xw-rq9v-758p

Memory safety bugs fixed in Firefox 109 and Firefox ESR 102.7

Priority MEDIUM 41CWE-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: 15 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 and the Mozilla Fuzzing Team reported memory safety bugs present in Firefox 108 and Firefox ESR 102.6. 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 < 109, Firefox ESR < 102.7, and Thunderbird < 102.7.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00702 53rd percentileScored 2026-11-07
Fix Partial Firefox (Mozilla): 109Firefox ESR (Mozilla): 102.7+1 more productRed Hat: 16 advisoriesRed Hat: 15 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
MozillaFirefoxbefore 109109Patch availableCNA
MozillaFirefox ESRbefore 102.7102.7Patch availableCNA
MozillaThunderbirdbefore 102.7102.7Patch availableCNA
  • Firefox VendorMozilla Affected before 109 Fixed in 109 Patch available CNA
  • Firefox ESR VendorMozilla Affected before 102.7 Fixed in 102.7 Patch available CNA
  • Thunderbird VendorMozilla Affected before 102.7 Fixed in 102.7 Patch available CNA

CPE configurations NVD · 3

CPEVersionsRoleVendor
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*before 109.0VulnerableMozilla
cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*before 102.7VulnerableMozilla
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*before 102.7VulnerableMozilla
  • cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* Versions before 109.0 Vulnerable ·Mozilla
  • cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:* Versions before 102.7 Vulnerable ·Mozilla
  • cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* Versions before 102.7 Vulnerable ·Mozilla

Remediation

  • Fix · CNA Firefox (Mozilla) Fixed in 109
  • Fix · CNA Firefox ESR (Mozilla) Fixed in 102.7
  • Fix · CNA Thunderbird (Mozilla) Fixed in 102.7

Red Hat 16 advisories

  • RHSA-2023:0476 Released 2023-01-26 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream (v. 9) thunderbird-102.7.1-1.el9_1
  • RHSA-2023:0463 Released 2023-01-25 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream (v. 8) thunderbird-102.7.1-1.el8_7
  • RHSA-2023:0462 Released 2023-01-25 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream EUS (v.8.6) thunderbird-102.7.1-1.el8_6
Show 13 more Red Hat advisories
  • RHSA-2023:0456 Released 2023-01-25 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux Client (v. 7) thunderbird-102.7.1-1.el7_9
    • Red Hat Enterprise Linux Server Optional (v. 7) thunderbird-102.7.1-1.el7_9
    • Red Hat Enterprise Linux Workstation (v. 7) thunderbird-102.7.1-1.el7_9
  • RHSA-2023:0460 Released 2023-01-25 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream EUS (v.8.4) thunderbird-102.7.1-1.el8_4
  • RHSA-2023:0461 Released 2023-01-25 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream EUS (v.9.0) thunderbird-102.7.1-1.el9_0
  • RHSA-2023:0459 Released 2023-01-25 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream AUS (v. 8.2) thunderbird-102.7.1-1.el8_2
    • Red Hat Enterprise Linux AppStream E4S (v. 8.2) thunderbird-102.7.1-1.el8_2
    • Red Hat Enterprise Linux AppStream TUS (v. 8.2) thunderbird-102.7.1-1.el8_2
  • RHSA-2023:0457 Released 2023-01-25 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream E4S (v. 8.1) thunderbird-102.7.1-1.el8_1
  • RHSA-2023:0289 Released 2023-01-23 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream EUS (v.8.6) firefox-102.7.0-1.el8_6
  • RHSA-2023:0294 Released 2023-01-23 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream AUS (v. 8.2) firefox-102.7.0-1.el8_2
    • Red Hat Enterprise Linux AppStream E4S (v. 8.2) firefox-102.7.0-1.el8_2
    • Red Hat Enterprise Linux AppStream TUS (v. 8.2) firefox-102.7.0-1.el8_2
  • RHSA-2023:0290 Released 2023-01-23 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream E4S (v. 8.1) firefox-102.7.0-1.el8_1
  • RHSA-2023:0296 Released 2023-01-23 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux Client (v. 7) firefox-102.7.0-1.el7_9
    • Red Hat Enterprise Linux Client Optional (v. 7) firefox-102.7.0-1.el7_9
    • Red Hat Enterprise Linux Server (v. 7) firefox-102.7.0-1.el7_9
    • Red Hat Enterprise Linux Server Optional (v. 7) firefox-102.7.0-1.el7_9
    • Red Hat Enterprise Linux Workstation (v. 7) firefox-102.7.0-1.el7_9
    • Red Hat Enterprise Linux Workstation Optional (v. 7) firefox-102.7.0-1.el7_9
  • RHSA-2023:0295 Released 2023-01-23 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream EUS (v.8.4) firefox-102.7.0-1.el8_4
  • RHSA-2023:0288 Released 2023-01-23 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream (v. 8) firefox-102.7.0-1.el8_7
  • RHSA-2023:0286 Released 2023-01-23 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream EUS (v.9.0) firefox-102.7.0-1.el9_0
  • RHSA-2023:0285 Released 2023-01-23 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream (v. 9) firefox-102.7.0-1.el9_1

Fixed in the same release

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

  • Release ·

    Mozilla Firefox 109

    10 records Highest priority Priority MEDIUM 3 MEDIUM, 7 LOW

    Other records, highest priority first

    • TI-2023-09431 Content Security Policy wasn't being correctly applied to WebSockets in WebWorkersPriority MEDIUM 62
    • TI-2023-09435 Memory safety bugs fixed in Firefox 109Priority MEDIUM 41
    • TI-2023-09432 Calls to console.log allowed bypassing Content Security Policy via format directivePriority LOW 30
    Show all 10 records →
  • Release ·

    Mozilla Firefox ESR, Thunderbird 102.7

    6 records Highest priority Priority MEDIUM 2 MEDIUM, 4 LOW

    Other records, highest priority first

    • TI-2023-09431 Content Security Policy wasn't being correctly applied to WebSockets in WebWorkersPriority MEDIUM 62
    • TI-2023-09432 Calls to console.log allowed bypassing Content Security Policy via format directivePriority LOW 30
    • TI-2023-09428 Malicious command could be hidden in devtools output on WindowsPriority LOW 30
    Show all 6 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-2023:0288, RHSA-2023:0463
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2023:0285, RHSA-2023:0476
Red Hat Enterprise Linux AppStream AUS (v. 8.2)Fixed RHSA-2023:0294, RHSA-2023:0459
Red Hat Enterprise Linux AppStream E4S (v. 8.1)Fixed RHSA-2023:0290, RHSA-2023:0457
Red Hat Enterprise Linux AppStream E4S (v. 8.2)Fixed RHSA-2023:0294, RHSA-2023:0459
Red Hat Enterprise Linux AppStream EUS (v.8.4)Fixed RHSA-2023:0295, RHSA-2023:0460
Red Hat Enterprise Linux AppStream EUS (v.8.6)Fixed RHSA-2023:0289, RHSA-2023:0462
Red Hat Enterprise Linux AppStream EUS (v.9.0)Fixed RHSA-2023:0286, RHSA-2023:0461
Red Hat Enterprise Linux AppStream TUS (v. 8.2)Fixed RHSA-2023:0294, RHSA-2023:0459
Red Hat Enterprise Linux Client (v. 7)Fixed RHSA-2023:0296, RHSA-2023:0456
Red Hat Enterprise Linux Client Optional (v. 7)Fixed RHSA-2023:0296
Red Hat Enterprise Linux Server (v. 7)Fixed RHSA-2023:0296
Red Hat Enterprise Linux Server Optional (v. 7)Fixed RHSA-2023:0296, RHSA-2023:0456
Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2023:0296, RHSA-2023:0456
Red Hat Enterprise Linux Workstation Optional (v. 7)Fixed RHSA-2023:0296

Timeline

  1. 2026-10-02 Threatist record created from CVE-2023-23605
  2. 2026-10-03 Alias added: GHSA-w9xw-rq9v-758p

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