Use after free in Mozilla Firefox
Priority MEDIUM 48CWE-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
- Fixed
Attack profile from CVSS 3.0 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-416 and the CVSS impact.
Summary
A use-after-free vulnerability can occur when refresh driver timers are refreshed in some circumstances during shutdown when the timer is deleted while still in use. This results in a potentially exploitable crash. This vulnerability affects Firefox < 62, Firefox ESR < 60.2, and Thunderbird < 60.2.1.
Why it matters now
EPSS 0.03357 88th percentileScored 2026-11-07
Fix Fixed Firefox (Mozilla): 62Firefox ESR (Mozilla): 60.2+1 more productRed Hat: 4 advisories
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Mozilla | Firefox | before 62 | 62 | Patch available | CNA |
| Mozilla | Firefox ESR | before 60.2 | 60.2 | Patch available | CNA |
| Mozilla | Thunderbird | before 60.2.1 | 60.2.1 | Patch available | CNA |
- Firefox VendorMozilla Affected before 62 Fixed in 62 Patch available CNA
- Firefox ESR VendorMozilla Affected before 60.2 Fixed in 60.2 Patch available CNA
- Thunderbird VendorMozilla Affected before 60.2.1 Fixed in 60.2.1 Patch available CNA
CPE configurations NVD · 17
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:redhat:enterprise_linux_desktop:6.0:*:*:*:*:*:*:* | 6.0 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:* | 7.0 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux_server:6.0:*:*:*:*:*:*:* | 6.0 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:* | 7.0 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux_server_aus:7.6:*:*:*:*:*:*:* | 7.6 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux_server_eus:7.5:*:*:*:*:*:*:* | 7.5 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux_server_eus:7.6:*:*:*:*:*:*:* | 7.6 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux_server_tus:7.6:*:*:*:*:*:*:* | 7.6 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux_workstation:6.0:*:*:*:*:*:*:* | 6.0 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:*:*:*:*:*:*:* | 7.0 | Vulnerable | Red Hat |
- cpe:2.3:o:redhat:enterprise_linux_desktop:6.0:*:*:*:*:*:*:* Versions 6.0 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:* Versions 7.0 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux_server:6.0:*:*:*:*:*:*:* Versions 6.0 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:* Versions 7.0 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux_server_aus:7.6:*:*:*:*:*:*:* Versions 7.6 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux_server_eus:7.5:*:*:*:*:*:*:* Versions 7.5 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux_server_eus:7.6:*:*:*:*:*:*:* Versions 7.6 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux_server_tus:7.6:*:*:*:*:*:*:* Versions 7.6 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux_workstation:6.0:*:*:*:*:*:*:* Versions 6.0 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:*:*:*:*:*:*:* Versions 7.0 Vulnerable ·Red Hat
Show 7 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:* | 8.0 | Vulnerable | Debian |
| cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* | 9.0 | Vulnerable | Debian |
| cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:* | 14.04 | Vulnerable | Canonical |
| cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:* | 16.04 | Vulnerable | Canonical |
| cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* | 18.04 | Vulnerable | Canonical |
| cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* | before 60.2.0; before 62.0 | Vulnerable | Mozilla |
| cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* | before 60.2.1 | Vulnerable | Mozilla |
- cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:* Versions 8.0 Vulnerable ·Debian
- cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Debian
- cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:* Versions 14.04 Vulnerable ·Canonical
- cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:* Versions 16.04 Vulnerable ·Canonical
- cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* Versions 18.04 Vulnerable ·Canonical
- cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* Versions before 60.2.0; before 62.0 Vulnerable ·Mozilla
- cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* Versions before 60.2.1 Vulnerable ·Mozilla
Remediation
- Fix · CNA Firefox (Mozilla) Fixed in 62
- Fix · CNA Firefox ESR (Mozilla) Fixed in 60.2
- Fix · CNA Thunderbird (Mozilla) Fixed in 60.2.1
Red Hat 4 advisories
- RHSA-2018:3458 Released 2018-11-05 · Red Hat rating Importantthunderbird security update
- Red Hat Enterprise Linux Client (v. 7) thunderbird-60.2.1-4.el7_5
- Red Hat Enterprise Linux Server Optional (v. 7) thunderbird-60.2.1-4.el7_5
- Red Hat Enterprise Linux Workstation (v. 7) thunderbird-60.2.1-4.el7_5
- Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) thunderbird-60.2.1-4.el7_5
- RHSA-2018:3403 Released 2018-10-30 · Red Hat rating Importantthunderbird security update
- Red Hat Enterprise Linux Desktop (v. 6) thunderbird-60.2.1-5.el6
- Red Hat Enterprise Linux Server Optional (v. 6) thunderbird-60.2.1-5.el6
- Red Hat Enterprise Linux Workstation (v. 6) thunderbird-60.2.1-5.el6
- RHSA-2018:2693 Released 2018-09-12 · Red Hat rating Criticalfirefox security update
- Red Hat Enterprise Linux Desktop (v. 6) firefox-60.2.0-1.el6
- Red Hat Enterprise Linux Desktop Optional (v. 6) firefox-60.2.0-1.el6
- Red Hat Enterprise Linux HPC Node Optional (v. 6) firefox-60.2.0-1.el6
- Red Hat Enterprise Linux Server (v. 6) firefox-60.2.0-1.el6
- Red Hat Enterprise Linux Server Optional (v. 6) firefox-60.2.0-1.el6
- Red Hat Enterprise Linux Workstation (v. 6) firefox-60.2.0-1.el6
- Red Hat Enterprise Linux Workstation Optional (v. 6) firefox-60.2.0-1.el6
Show 1 more Red Hat advisories
- RHSA-2018:2692 Released 2018-09-12 · Red Hat rating Criticalfirefox security update
- Red Hat Enterprise Linux Client (v. 7) firefox-60.2.0-1.el7_5
- Red Hat Enterprise Linux Client Optional (v. 7) firefox-60.2.0-1.el7_5
- Red Hat Enterprise Linux Server (v. 7) firefox-60.2.0-1.el7_5
- Red Hat Enterprise Linux Server Optional (v. 7) firefox-60.2.0-1.el7_5
- Red Hat Enterprise Linux Workstation (v. 7) firefox-60.2.0-1.el7_5
- Red Hat Enterprise Linux Workstation Optional (v. 7) firefox-60.2.0-1.el7_5
- Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) firefox-60.2.0-1.el7_5
Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Advisory ·
Mozilla Firefox, Firefox ESR, Thunderbird — USN-3761-1
5 records Highest priority Priority MEDIUM 4 MEDIUM, 1 LOW
Other records, highest priority first
- TI-2018-08879 Use after free in Mozilla FirefoxPriority MEDIUM 48
- TI-2018-08877 Memory corruption in Mozilla FirefoxPriority MEDIUM 48
- TI-2018-08876 Memory corruption in Mozilla FirefoxPriority MEDIUM 42
- Advisory ·
Mozilla Firefox, Firefox ESR, Thunderbird — USN-3793-1
5 records Highest priority Priority MEDIUM 3 MEDIUM, 2 LOW
Other records, highest priority first
- TI-2018-08879 Use after free in Mozilla FirefoxPriority MEDIUM 48
- TI-2018-08877 Memory corruption in Mozilla FirefoxPriority MEDIUM 48
- TI-2018-08885 Improper input validation in Mozilla ThunderbirdPriority LOW 31
Show 1 more group
- Advisory ·
Mozilla Firefox, Firefox ESR, Thunderbird — DSA-4287
3 records Highest priority Priority MEDIUM 3 MEDIUM
Other records, highest priority first
- TI-2018-08879 Use after free in Mozilla FirefoxPriority MEDIUM 48
- TI-2018-08877 Memory corruption in Mozilla FirefoxPriority MEDIUM 48
Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux Client (v. 7) | Fixed | RHSA-2018:2692, RHSA-2018:3458 |
| Red Hat Enterprise Linux Client Optional (v. 7) | Fixed | RHSA-2018:2692 |
| Red Hat Enterprise Linux Desktop (v. 6) | Fixed | RHSA-2018:2693, RHSA-2018:3403 |
| Red Hat Enterprise Linux Desktop Optional (v. 6) | Fixed | RHSA-2018:2693 |
| Red Hat Enterprise Linux HPC Node Optional (v. 6) | Fixed | RHSA-2018:2693 |
| Red Hat Enterprise Linux Server (v. 6) | Fixed | RHSA-2018:2693 |
| Red Hat Enterprise Linux Server (v. 7) | Fixed | RHSA-2018:2692 |
| Red Hat Enterprise Linux Server Optional (v. 6) | Fixed | RHSA-2018:2693, RHSA-2018:3403 |
| Red Hat Enterprise Linux Server Optional (v. 7) | Fixed | RHSA-2018:2692, RHSA-2018:3458 |
| Red Hat Enterprise Linux Workstation (v. 6) | Fixed | RHSA-2018:2693, RHSA-2018:3403 |
| Red Hat Enterprise Linux Workstation (v. 7) | Fixed | RHSA-2018:2692, RHSA-2018:3458 |
| Red Hat Enterprise Linux Workstation Optional (v. 6) | Fixed | RHSA-2018:2693 |
| Red Hat Enterprise Linux Workstation Optional (v. 7) | Fixed | RHSA-2018:2692 |
| Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) | Fixed | RHSA-2018:2692 |
| Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) | Fixed | RHSA-2018:3458 |
Timeline
- 2026-10-02 Threatist record created from CVE-2018-12377
- 2026-10-03 Alias added: GHSA-q5f8-grf8-9ff4
References
Advisory 15
- GLSA-201810-01
- RHSA-2018:2693
- [debian-lts-announce] 20181112 [SECURITY] [DLA 1575-1] thunderbird security update
- GLSA-201811-13
- DSA-4327
- RHSA-2018:3403
- https://www.mozilla.org/security/advisories/mfsa2018-20/
- https://bugzilla.mozilla.org/show_bug.cgi?id=1470260
- RHSA-2018:2692
- RHSA-2018:3458
- USN-3793-1
- https://www.mozilla.org/security/advisories/mfsa2018-21/
- https://www.mozilla.org/security/advisories/mfsa2018-25/
- USN-3761-1
- DSA-4287
More Mozilla Firefox vulnerabilities
- 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
Sources
- CVE-2018-12377 · CVE Program
- CVE-2018-12377 · NVD
- FIRST EPSS
- GHSA-q5f8-grf8-9ff4 · GitHub Advisory Database · CC BY 4.0
- CVE-2018-12377 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences