Out-of-bounds write in Mozilla Firefox
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: 14 fixed, 1 without a fix
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-787 and the CVSS impact.
Summary
Mozilla developers and community members reported memory safety bugs present in Firefox 68, Firefox ESR 68, and Firefox 60.8. Some of these bugs showed evidence of memory corruption and we presume that with enough effort that some of these could be exploited to run arbitrary code. This vulnerability affects Firefox < 69, Thunderbird < 68.1, Thunderbird < 60.9, Firefox ESR < 60.9, and Firefox ESR < 68.1.
Why it matters now
EPSS 0.01643 76th percentileScored 2026-11-07
Fix Partial Firefox (Mozilla): 69Thunderbird (Mozilla): 68.1, 60.9+1 more productRed Hat: 6 advisoriesRed Hat: 14 fixed, 1 without a fix
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 69 | 69 | Patch available | CNA |
| Mozilla | Thunderbird | before 68.1; before 60.9 | 68.1, 60.9 | Patch available | CNA |
| Mozilla | Firefox ESR | before 60.9; before 68.1 | 60.9, 68.1 | Patch available | CNA |
- Firefox VendorMozilla Affected before 69 Fixed in 69 Patch available CNA
- Thunderbird VendorMozilla Affected before 68.1; before 60.9 Fixed in 68.1, 60.9 Patch available CNA
- Firefox ESR VendorMozilla Affected before 60.9; before 68.1 Fixed in 60.9, 68.1 Patch available CNA
CPE configurations NVD · 8
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* | before 60.9.0; before 69.0 | Vulnerable | Mozilla |
| cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:* | 68.0 to before 68.1.0 | Vulnerable | Mozilla |
| cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* | before 60.9.0; 68.0 to before 68.1.0 | Vulnerable | Mozilla |
| cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:* | 16.04 | Vulnerable | Canonical |
| cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* | 18.04 | Vulnerable | Canonical |
| cpe:2.3:o:canonical:ubuntu_linux:19.04:*:*:*:*:*:*:* | 19.04 | Vulnerable | Canonical |
| cpe:2.3:o:opensuse:leap:15.0:*:*:*:*:*:*:* | 15.0 | Vulnerable | openSUSE |
| cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:* | 15.1 | Vulnerable | openSUSE |
- cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* Versions before 60.9.0; before 69.0 Vulnerable ·Mozilla
- cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:* Versions 68.0 to before 68.1.0 Vulnerable ·Mozilla
- cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* Versions before 60.9.0; 68.0 to before 68.1.0 Vulnerable ·Mozilla
- cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:* Versions 16.04 Vulnerable ·Canonical
- cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* Versions 18.04 Vulnerable ·Canonical
- cpe:2.3:o:canonical:ubuntu_linux:19.04:*:*:*:*:*:*:* Versions 19.04 Vulnerable ·Canonical
- cpe:2.3:o:opensuse:leap:15.0:*:*:*:*:*:*:* Versions 15.0 Vulnerable ·openSUSE
- cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:* Versions 15.1 Vulnerable ·openSUSE
Remediation
- Fix · CNA Firefox (Mozilla) Fixed in 69
- Fix · CNA Thunderbird (Mozilla) Fixed in 68.1, 60.9
- Fix · CNA Firefox ESR (Mozilla) Fixed in 60.9, 68.1
Red Hat 6 advisories
- RHSA-2019:2807 Released 2019-09-19 · Red Hat rating Importantthunderbird security update
- Red Hat Enterprise Linux Desktop (v. 6) thunderbird-60.9.0-1.el6_10
- Red Hat Enterprise Linux Server Optional (v. 6) thunderbird-60.9.0-1.el6_10
- Red Hat Enterprise Linux Workstation (v. 6) thunderbird-60.9.0-1.el6_10
- RHSA-2019:2773 Released 2019-09-19 · Red Hat rating Importantthunderbird security update
- Red Hat Enterprise Linux Client (v. 7) thunderbird-60.9.0-1.el7_7
- Red Hat Enterprise Linux Server Optional (v. 7) thunderbird-60.9.0-1.el7_7
- Red Hat Enterprise Linux Workstation (v. 7) thunderbird-60.9.0-1.el7_7
- RHSA-2019:2774 Released 2019-09-16 · Red Hat rating Importantthunderbird security update
- Red Hat Enterprise Linux AppStream (v. 8) thunderbird-60.9.0-2.el8_0
Show 3 more Red Hat advisories
- RHSA-2019:2694 Released 2019-09-12 · Red Hat rating Importantfirefox security update
- Red Hat Enterprise Linux Desktop (v. 6) firefox-60.9.0-1.el6_10
- Red Hat Enterprise Linux Desktop Optional (v. 6) firefox-60.9.0-1.el6_10
- Red Hat Enterprise Linux HPC Node Optional (v. 6) firefox-60.9.0-1.el6_10
- Red Hat Enterprise Linux Server (v. 6) firefox-60.9.0-1.el6_10
- Red Hat Enterprise Linux Server Optional (v. 6) firefox-60.9.0-1.el6_10
- Red Hat Enterprise Linux Workstation (v. 6) firefox-60.9.0-1.el6_10
- Red Hat Enterprise Linux Workstation Optional (v. 6) firefox-60.9.0-1.el6_10
- RHSA-2019:2729 Released 2019-09-12 · Red Hat rating Importantfirefox security update
- Red Hat Enterprise Linux Client (v. 7) firefox-60.9.0-1.el7_7
- Red Hat Enterprise Linux Client Optional (v. 7) firefox-60.9.0-1.el7_7
- Red Hat Enterprise Linux Server (v. 7) firefox-60.9.0-1.el7_7
- Red Hat Enterprise Linux Server Optional (v. 7) firefox-60.9.0-1.el7_7
- Red Hat Enterprise Linux Workstation (v. 7) firefox-60.9.0-1.el7_7
- Red Hat Enterprise Linux Workstation Optional (v. 7) firefox-60.9.0-1.el7_7
- RHSA-2019:2663 Released 2019-09-04 · Red Hat rating Importantfirefox security update
- Red Hat Enterprise Linux AppStream (v. 8) firefox-68.1.0-1.el8_0
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-4150-1
7 records Highest priority Priority MEDIUM 3 MEDIUM, 4 LOW
Other records, highest priority first
- TI-2019-08809 Use after free in Mozilla FirefoxPriority MEDIUM 42
- TI-2019-08803 Use after free in Mozilla FirefoxPriority MEDIUM 41
- TI-2019-08799 A same-origin policy violation occurs allowing the theft of cross-origin images through a…Priority LOW 32
- Advisory ·
Mozilla Firefox, Firefox ESR, Thunderbird — GLSA-201911-07
6 records Highest priority Priority MEDIUM 3 MEDIUM, 3 LOW
Other records, highest priority first
- TI-2019-08809 Use after free in Mozilla FirefoxPriority MEDIUM 42
- TI-2019-08803 Use after free in Mozilla FirefoxPriority MEDIUM 41
- TI-2019-08799 A same-origin policy violation occurs allowing the theft of cross-origin images through a…Priority LOW 32
Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 5 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux AppStream (v. 8) | Fixed | RHSA-2019:2663, RHSA-2019:2774 |
| Red Hat Enterprise Linux Client (v. 7) | Fixed | RHSA-2019:2729, RHSA-2019:2773 |
| Red Hat Enterprise Linux Client Optional (v. 7) | Fixed | RHSA-2019:2729 |
| Red Hat Enterprise Linux Desktop (v. 6) | Fixed | RHSA-2019:2694, RHSA-2019:2807 |
| Red Hat Enterprise Linux Desktop Optional (v. 6) | Fixed | RHSA-2019:2694 |
| Red Hat Enterprise Linux HPC Node Optional (v. 6) | Fixed | RHSA-2019:2694 |
| Red Hat Enterprise Linux Server (v. 6) | Fixed | RHSA-2019:2694 |
| Red Hat Enterprise Linux Server (v. 7) | Fixed | RHSA-2019:2729 |
| Red Hat Enterprise Linux Server Optional (v. 6) | Fixed | RHSA-2019:2694, RHSA-2019:2807 |
| Red Hat Enterprise Linux Server Optional (v. 7) | Fixed | RHSA-2019:2729, RHSA-2019:2773 |
| Red Hat Enterprise Linux Workstation (v. 6) | Fixed | RHSA-2019:2694, RHSA-2019:2807 |
| Red Hat Enterprise Linux Workstation (v. 7) | Fixed | RHSA-2019:2729, RHSA-2019:2773 |
| Red Hat Enterprise Linux Workstation Optional (v. 6) | Fixed | RHSA-2019:2694 |
| Red Hat Enterprise Linux Workstation Optional (v. 7) | Fixed | RHSA-2019:2729 |
Timeline
- 2026-10-02 Threatist record created from CVE-2019-11740
- 2026-10-03 Alias added: GHSA-6wqx-grg2-grhw
References
Advisory 12
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=1563133%2C1573160
- https://www.mozilla.org/security/advisories/mfsa2019-25/
- https://www.mozilla.org/security/advisories/mfsa2019-27/
- https://www.mozilla.org/security/advisories/mfsa2019-26/
- https://www.mozilla.org/security/advisories/mfsa2019-29/
- https://www.mozilla.org/security/advisories/mfsa2019-30/
- openSUSE-SU-2019:2248
- openSUSE-SU-2019:2249
- openSUSE-SU-2019:2251
- openSUSE-SU-2019:2260
- USN-4150-1
- GLSA-201911-07
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-2019-11740 · CVE Program
- CVE-2019-11740 · NVD
- FIRST EPSS
- GHSA-6wqx-grg2-grhw · GitHub Advisory Database · CC BY 4.0
- CVE-2019-11740 · Red Hat security data · CC BY 4.0
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