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TI-2025-05825 Aliases CVE-2025-6424GHSA-87c4-94w2-rw7j

Use-after-free in FontFaceSet

Priority MEDIUM 60CWE-416Published · 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
Partial Red Hat: 14 fixed, 3 without a fix

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat. Impact type from CWE-416 and the CVSS impact.

Summary

A use-after-free in FontFaceSet resulted in a potentially exploitable crash. This vulnerability was fixed in Firefox 140, Firefox ESR 115.25, Firefox ESR 128.12, Thunderbird 140, and Thunderbird 128.12.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.07964 94th percentileScored 2026-11-07
Fix Partial Firefox (Mozilla): 115.25, 128.12, 140Thunderbird (Mozilla): 128.12, 140Red Hat: 21 advisoriesRed Hat: 14 fixed, 3 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
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—115.25, 128.12, 140Patch availableCNA
MozillaThunderbird—128.12, 140Patch availableCNA
  • Firefox VendorMozilla Affected — Fixed in 115.25, 128.12, 140 Patch available CNA
  • Thunderbird VendorMozilla Affected — Fixed in 128.12, 140 Patch available CNA

CPE configurations NVD · 3

CPEVersionsRoleVendor
cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*before 115.25.0VulnerableMozilla
cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*before 140.0VulnerableMozilla
cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*116.0 to before 128.12.0VulnerableMozilla
  • cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:* Versions before 115.25.0 Vulnerable ·Mozilla
  • cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:* Versions before 140.0 Vulnerable ·Mozilla
  • cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:* Versions 116.0 to before 128.12.0 Vulnerable ·Mozilla

Remediation

  • Fix · CNA Firefox (Mozilla) Fixed in 115.25, 128.12, 140
  • Fix · CNA Thunderbird (Mozilla) Fixed in 128.12, 140

Red Hat 21 advisories

  • RHSA-2025:10246 Released 2025-07-02 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream (v. 8) thunderbird-128.12.0-1.el8_10
  • RHSA-2025:10196 Released 2025-07-02 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream (v. 9) thunderbird-128.12.0-1.el9_6
  • RHSA-2025:10195 Released 2025-07-02 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream (v. 10) thunderbird-128.12.0-1.el10_0
Show 18 more Red Hat advisories
  • RHSA-2025:10188 Released 2025-07-02 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream EUS (v.9.4) firefox-128.12.0-1.el9_4, firefox-x11-128.12.0-1.el9_4
  • RHSA-2025:10186 Released 2025-07-02 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream E4S (v.8.8) firefox-128.12.0-1.el8_8
    • Red Hat Enterprise Linux AppStream TUS (v.8.8) firefox-128.12.0-1.el8_8
  • RHSA-2025:10185 Released 2025-07-02 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.2) firefox-128.12.0-1.el9_2, firefox-x11-128.12.0-1.el9_2
  • RHSA-2025:10183 Released 2025-07-02 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.6) firefox-128.12.0-1.el8_6
    • Red Hat Enterprise Linux AppStream E4S (v.8.6) firefox-128.12.0-1.el8_6
    • Red Hat Enterprise Linux AppStream TUS (v.8.6) firefox-128.12.0-1.el8_6
  • RHSA-2025:10187 Released 2025-07-02 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.0) firefox-128.12.0-1.el9_0
  • RHSA-2025:10184 Released 2025-07-02 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.4) firefox-128.12.0-1.el8_4
  • RHSA-2025:10181 Released 2025-07-02 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux Server (v. 7 ELS) firefox-128.12.0-1.el7_9
  • RHSA-2025:10182 Released 2025-07-02 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream AUS (v. 8.2) firefox-128.12.0-1.el8_2
  • RHSA-2025:10072 Released 2025-07-01 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream (v. 9) firefox-128.12.0-1.el9_6, firefox-x11-128.12.0-1.el9_6
  • RHSA-2025:10164 Released 2025-07-01 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.6) thunderbird-128.12.0-1.el8_6
    • Red Hat Enterprise Linux AppStream E4S (v.8.6) thunderbird-128.12.0-1.el8_6
    • Red Hat Enterprise Linux AppStream TUS (v.8.6) thunderbird-128.12.0-1.el8_6
  • RHSA-2025:10073 Released 2025-07-01 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream (v. 10) firefox-128.12.0-1.el10_0
  • RHSA-2025:10159 Released 2025-07-01 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream EUS (v.9.4) thunderbird-128.12.0-1.el9_4
  • RHSA-2025:10160 Released 2025-07-01 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.2) thunderbird-128.12.0-1.el9_2
  • RHSA-2025:10163 Released 2025-07-01 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream E4S (v.8.8) thunderbird-128.12.0-1.el8_8
    • Red Hat Enterprise Linux AppStream TUS (v.8.8) thunderbird-128.12.0-1.el8_8
  • RHSA-2025:10165 Released 2025-07-01 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.4) thunderbird-128.12.0-1.el8_4
  • RHSA-2025:10161 Released 2025-07-01 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.0) thunderbird-128.12.0-1.el9_0
  • RHSA-2025:10166 Released 2025-07-01 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream AUS (v. 8.2) thunderbird-128.12.0-1.el8_2
  • RHSA-2025:10074 Released 2025-07-01 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream (v. 8) firefox-128.12.0-1.el8_10

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat Enterprise Linux 10AffectedNo fix yet
Red Hat Enterprise Linux 6AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 7AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2025:10073, RHSA-2025:10195
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2025:10074, RHSA-2025:10246
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2025:10072, RHSA-2025:10196
Red Hat Enterprise Linux AppStream AUS (v. 8.2)Fixed RHSA-2025:10166, RHSA-2025:10182
Red Hat Enterprise Linux AppStream AUS (v.8.4)Fixed RHSA-2025:10165, RHSA-2025:10184
Red Hat Enterprise Linux AppStream AUS (v.8.6)Fixed RHSA-2025:10164, RHSA-2025:10183
Red Hat Enterprise Linux AppStream E4S (v.8.6)Fixed RHSA-2025:10164, RHSA-2025:10183
Red Hat Enterprise Linux AppStream E4S (v.8.8)Fixed RHSA-2025:10163, RHSA-2025:10186
Red Hat Enterprise Linux AppStream E4S (v.9.0)Fixed RHSA-2025:10161, RHSA-2025:10187
Red Hat Enterprise Linux AppStream E4S (v.9.2)Fixed RHSA-2025:10160, RHSA-2025:10185
Red Hat Enterprise Linux AppStream EUS (v.9.4)Fixed RHSA-2025:10159, RHSA-2025:10188
Red Hat Enterprise Linux AppStream TUS (v.8.6)Fixed RHSA-2025:10164, RHSA-2025:10183
Red Hat Enterprise Linux AppStream TUS (v.8.8)Fixed RHSA-2025:10163, RHSA-2025:10186
Red Hat Enterprise Linux Server (v. 7 ELS)Fixed RHSA-2025:10181

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-6424
  2. 2026-10-03 Alias added: GHSA-87c4-94w2-rw7j

References

Advisory 3

Other 3

  • 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