Read the docs
TI-2025-00859 Aliases CVE-2025-1017GHSA-2ccw-r7qp-2p9j

Memory safety bugs fixed in Firefox 135, Thunderbird 135, Firefox ESR 128.7, and Thunderbird 128.7

Priority MEDIUM 43CWE-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
Partial Red Hat: 14 fixed, 4 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

Memory safety bugs present in Firefox 134, Thunderbird 134, Firefox ESR 128.6, and Thunderbird 128.6. 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 was fixed in Firefox 135, Firefox ESR 128.7, Thunderbird 128.7, and Thunderbird 135.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00579 47th percentileScored 2026-11-07
Fix Partial Firefox (Mozilla): 128.7, 135Thunderbird (Mozilla): 128.7, 135Red Hat: 19 advisoriesRed Hat: 14 fixed, 4 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

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—128.7, 135Patch availableCNA
MozillaThunderbird—128.7, 135Patch availableCNA
  • Firefox VendorMozilla Affected — Fixed in 128.7, 135 Patch available CNA
  • Thunderbird VendorMozilla Affected — Fixed in 128.7, 135 Patch available CNA

CPE configurations NVD · 4

CPEVersionsRoleVendor
cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*before 128.7.0VulnerableMozilla
cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*before 135.0VulnerableMozilla
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:*128.0.1 to before 128.7.0VulnerableMozilla
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*131.0 to before 135.0VulnerableMozilla
  • cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:* Versions before 128.7.0 Vulnerable ·Mozilla
  • cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:* Versions before 135.0 Vulnerable ·Mozilla
  • cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:* Versions 128.0.1 to before 128.7.0 Vulnerable ·Mozilla
  • cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:* Versions 131.0 to before 135.0 Vulnerable ·Mozilla

Remediation

  • Fix · CNA Firefox (Mozilla) Fixed in 128.7, 135
  • Fix · CNA Thunderbird (Mozilla) Fixed in 128.7, 135

Red Hat 19 advisories

  • RHSA-2025:1348 Released 2025-02-12 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream AUS (v. 8.2) thunderbird-128.7.0-1.el8_2
  • RHSA-2025:1341 Released 2025-02-12 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.6) thunderbird-128.7.0-1.el8_6
    • Red Hat Enterprise Linux AppStream E4S (v.8.6) thunderbird-128.7.0-1.el8_6
    • Red Hat Enterprise Linux AppStream TUS (v.8.6) thunderbird-128.7.0-1.el8_6
  • RHSA-2025:1340 Released 2025-02-12 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream EUS (v.8.8) thunderbird-128.7.0-1.el8_8
Show 16 more Red Hat advisories
  • RHSA-2025:1339 Released 2025-02-12 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.4) thunderbird-128.7.0-1.el8_4
    • Red Hat Enterprise Linux AppStream E4S (v.8.4) thunderbird-128.7.0-1.el8_4
    • Red Hat Enterprise Linux AppStream TUS (v.8.4) thunderbird-128.7.0-1.el8_4
  • RHSA-2025:1318 Released 2025-02-11 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream EUS (v.9.4) thunderbird-128.7.0-1.el9_4
  • RHSA-2025:1317 Released 2025-02-11 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream EUS (v.9.2) thunderbird-128.7.0-1.el9_2
  • RHSA-2025:1319 Released 2025-02-11 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.0) thunderbird-128.7.0-1.el9_0
  • RHSA-2025:1292 Released 2025-02-11 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream (v. 8) thunderbird-128.7.0-1.el8_10
  • RHSA-2025:1283 Released 2025-02-11 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream (v. 8) firefox-128.7.0-1.el8_10
  • RHSA-2025:1184 Released 2025-02-10 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream (v. 9) thunderbird-128.7.0-1.el9_5
  • RHSA-2025:1140 Released 2025-02-06 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream EUS (v.9.4) firefox-128.7.0-1.el9_4, firefox-x11-128.7.0-1.el9_4
  • RHSA-2025:1139 Released 2025-02-06 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream EUS (v.9.2) firefox-128.7.0-1.el9_2, firefox-x11-128.7.0-1.el9_2
  • RHSA-2025:1137 Released 2025-02-06 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream EUS (v.8.8) firefox-128.7.0-1.el8_8
  • RHSA-2025:1132 Released 2025-02-06 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux Server (v. 7 ELS) firefox-128.7.0-1.el7_9
  • RHSA-2025:1136 Released 2025-02-06 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.6) firefox-128.7.0-1.el8_6
    • Red Hat Enterprise Linux AppStream E4S (v.8.6) firefox-128.7.0-1.el8_6
    • Red Hat Enterprise Linux AppStream TUS (v.8.6) firefox-128.7.0-1.el8_6
  • RHSA-2025:1138 Released 2025-02-06 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.0) firefox-128.7.0-1.el9_0
  • RHSA-2025:1135 Released 2025-02-06 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.4) firefox-128.7.0-1.el8_4
    • Red Hat Enterprise Linux AppStream E4S (v.8.4) firefox-128.7.0-1.el8_4
    • Red Hat Enterprise Linux AppStream TUS (v.8.4) firefox-128.7.0-1.el8_4
  • RHSA-2025:1133 Released 2025-02-06 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream AUS (v. 8.2) firefox-128.7.0-1.el8_2
  • RHSA-2025:1066 Released 2025-02-05 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream (v. 9) firefox-128.7.0-1.el9_5, firefox-x11-128.7.0-1.el9_5

Vendor assessments

Red Hat

Red Hat rating: Moderate. 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 9AffectedNo fix yet
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2025:1283, RHSA-2025:1292
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2025:1066, RHSA-2025:1184
Red Hat Enterprise Linux AppStream AUS (v. 8.2)Fixed RHSA-2025:1133, RHSA-2025:1348
Red Hat Enterprise Linux AppStream AUS (v.8.4)Fixed RHSA-2025:1135, RHSA-2025:1339
Red Hat Enterprise Linux AppStream AUS (v.8.6)Fixed RHSA-2025:1136, RHSA-2025:1341
Red Hat Enterprise Linux AppStream E4S (v.8.4)Fixed RHSA-2025:1135, RHSA-2025:1339
Red Hat Enterprise Linux AppStream E4S (v.8.6)Fixed RHSA-2025:1136, RHSA-2025:1341
Red Hat Enterprise Linux AppStream E4S (v.9.0)Fixed RHSA-2025:1138, RHSA-2025:1319
Red Hat Enterprise Linux AppStream EUS (v.8.8)Fixed RHSA-2025:1137, RHSA-2025:1340
Red Hat Enterprise Linux AppStream EUS (v.9.2)Fixed RHSA-2025:1139, RHSA-2025:1317
Red Hat Enterprise Linux AppStream EUS (v.9.4)Fixed RHSA-2025:1140, RHSA-2025:1318
Red Hat Enterprise Linux AppStream TUS (v.8.4)Fixed RHSA-2025:1135, RHSA-2025:1339
Red Hat Enterprise Linux AppStream TUS (v.8.6)Fixed RHSA-2025:1136, RHSA-2025:1341
Red Hat Enterprise Linux Server (v. 7 ELS)Fixed RHSA-2025:1132

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-1017
  2. 2026-10-03 Alias added: GHSA-2ccw-r7qp-2p9j

References

Advisory 4

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