Out-of-bounds write in Mozilla Thunderbird
Priority MEDIUM 46CWE-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
- Fixed
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 65, Firefox ESR 60.5, and Thunderbird 60.5. 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 Thunderbird < 60.6, Firefox ESR < 60.6, and Firefox < 66.
Why it matters now
EPSS 0.02244 82nd percentileScored 2026-11-07
Fix Fixed Thunderbird (Mozilla): 60.6Firefox ESR (Mozilla): 60.6+1 more productRed Hat: 6 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 | Thunderbird | before 60.6 | 60.6 | Patch available | CNA |
| Mozilla | Firefox ESR | before 60.6 | 60.6 | Patch available | CNA |
| Mozilla | Firefox | before 66 | 66 | Patch available | CNA |
- Thunderbird VendorMozilla Affected before 60.6 Fixed in 60.6 Patch available CNA
- Firefox ESR VendorMozilla Affected before 60.6 Fixed in 60.6 Patch available CNA
- Firefox VendorMozilla Affected before 66 Fixed in 66 Patch available CNA
CPE configurations NVD · 10
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* | before 60.6.0; before 66.0 | Vulnerable | Mozilla |
| cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* | before 60.6.0 | Vulnerable | Mozilla |
| cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:* | 8.0 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux_eus:8.1:*:*:*:*:*:*:* | 8.1 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux_eus:8.2:*:*:*:*:*:*:* | 8.2 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux_eus:8.4:*:*:*:*:*:*:* | 8.4 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux_server_aus:8.2:*:*:*:*:*:*:* | 8.2 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux_server_aus:8.4:*:*:*:*:*:*:* | 8.4 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux_server_tus:8.2:*:*:*:*:*:*:* | 8.2 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux_server_tus:8.4:*:*:*:*:*:*:* | 8.4 | Vulnerable | Red Hat |
- cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* Versions before 60.6.0; before 66.0 Vulnerable ·Mozilla
- cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* Versions before 60.6.0 Vulnerable ·Mozilla
- cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:* Versions 8.0 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux_eus:8.1:*:*:*:*:*:*:* Versions 8.1 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux_eus:8.2:*:*:*:*:*:*:* Versions 8.2 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux_eus:8.4:*:*:*:*:*:*:* Versions 8.4 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux_server_aus:8.2:*:*:*:*:*:*:* Versions 8.2 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux_server_aus:8.4:*:*:*:*:*:*:* Versions 8.4 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux_server_tus:8.2:*:*:*:*:*:*:* Versions 8.2 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux_server_tus:8.4:*:*:*:*:*:*:* Versions 8.4 Vulnerable ·Red Hat
Remediation
- Fix · CNA Thunderbird (Mozilla) Fixed in 60.6
- Fix · CNA Firefox ESR (Mozilla) Fixed in 60.6
- Fix · CNA Firefox (Mozilla) Fixed in 66
Red Hat 6 advisories
- RHSA-2019:1144 Released 2019-05-13 · Red Hat rating Importantthunderbird security update
- Red Hat Enterprise Linux AppStream (v. 8) thunderbird-60.6.1-1.el8
- RHSA-2019:0966 Released 2019-05-07 · Red Hat rating Criticalfirefox security update
- Red Hat Enterprise Linux AppStream (v. 8) firefox-60.6.1-1.el8
- RHSA-2019:0681 Released 2019-03-28 · Red Hat rating Importantthunderbird security update
- Red Hat Enterprise Linux Client (v. 7) thunderbird-60.6.1-1.el7_6
- Red Hat Enterprise Linux Server Optional (v. 7) thunderbird-60.6.1-1.el7_6
- Red Hat Enterprise Linux Workstation (v. 7) thunderbird-60.6.1-1.el7_6
- Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) thunderbird-60.6.1-1.el7_6
Show 3 more Red Hat advisories
- RHSA-2019:0680 Released 2019-03-28 · Red Hat rating Importantthunderbird security update
- Red Hat Enterprise Linux Desktop (v. 6) thunderbird-60.6.1-1.el6_10
- Red Hat Enterprise Linux Server Optional (v. 6) thunderbird-60.6.1-1.el6_10
- Red Hat Enterprise Linux Workstation (v. 6) thunderbird-60.6.1-1.el6_10
- RHSA-2019:0623 Released 2019-03-20 · Red Hat rating Criticalfirefox security update
- Red Hat Enterprise Linux Desktop (v. 6) firefox-60.6.0-3.el6_10
- Red Hat Enterprise Linux Desktop Optional (v. 6) firefox-60.6.0-3.el6_10
- Red Hat Enterprise Linux HPC Node Optional (v. 6) firefox-60.6.0-3.el6_10
- Red Hat Enterprise Linux Server (v. 6) firefox-60.6.0-3.el6_10
- Red Hat Enterprise Linux Server Optional (v. 6) firefox-60.6.0-3.el6_10
- Red Hat Enterprise Linux Workstation (v. 6) firefox-60.6.0-3.el6_10
- Red Hat Enterprise Linux Workstation Optional (v. 6) firefox-60.6.0-3.el6_10
- RHSA-2019:0622 Released 2019-03-20 · Red Hat rating Criticalfirefox security update
- Red Hat Enterprise Linux Client (v. 7) firefox-60.6.0-3.el7_6
- Red Hat Enterprise Linux Client Optional (v. 7) firefox-60.6.0-3.el7_6
- Red Hat Enterprise Linux Server (v. 7) firefox-60.6.0-3.el7_6
- Red Hat Enterprise Linux Server Optional (v. 7) firefox-60.6.0-3.el7_6
- Red Hat Enterprise Linux Workstation (v. 7) firefox-60.6.0-3.el7_6
- Red Hat Enterprise Linux Workstation Optional (v. 7) firefox-60.6.0-3.el7_6
- Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) firefox-60.6.0-3.el7_6
Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Release ·
Mozilla Firefox 66
21 records Highest priority Priority MEDIUM 10 MEDIUM, 11 LOW
Other records, highest priority first
- TI-2019-07177 Type confusion in Mozilla ThunderbirdPriority MEDIUM 61
- TI-2019-07178 Out-of-bounds write in Mozilla ThunderbirdPriority MEDIUM 57
- TI-2019-07190 OS command injection in Mozilla FirefoxPriority MEDIUM 46
- Release ·
Mozilla Firefox ESR, Thunderbird 60.6
9 records Highest priority Priority MEDIUM 7 MEDIUM, 2 LOW
Other records, highest priority first
- TI-2019-07177 Type confusion in Mozilla ThunderbirdPriority MEDIUM 61
- TI-2019-07178 Out-of-bounds write in Mozilla ThunderbirdPriority MEDIUM 57
- TI-2019-07182 Use after free in Mozilla ThunderbirdPriority MEDIUM 46
Vendor assessments
Red Hat
Red Hat rating: Critical. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux AppStream (v. 8) | Fixed | RHSA-2019:0966, RHSA-2019:1144 |
| Red Hat Enterprise Linux Client (v. 7) | Fixed | RHSA-2019:0622, RHSA-2019:0681 |
| Red Hat Enterprise Linux Client Optional (v. 7) | Fixed | RHSA-2019:0622 |
| Red Hat Enterprise Linux Desktop (v. 6) | Fixed | RHSA-2019:0623, RHSA-2019:0680 |
| Red Hat Enterprise Linux Desktop Optional (v. 6) | Fixed | RHSA-2019:0623 |
| Red Hat Enterprise Linux HPC Node Optional (v. 6) | Fixed | RHSA-2019:0623 |
| Red Hat Enterprise Linux Server (v. 6) | Fixed | RHSA-2019:0623 |
| Red Hat Enterprise Linux Server (v. 7) | Fixed | RHSA-2019:0622 |
| Red Hat Enterprise Linux Server Optional (v. 6) | Fixed | RHSA-2019:0623, RHSA-2019:0680 |
| Red Hat Enterprise Linux Server Optional (v. 7) | Fixed | RHSA-2019:0622, RHSA-2019:0681 |
| Red Hat Enterprise Linux Workstation (v. 6) | Fixed | RHSA-2019:0623, RHSA-2019:0680 |
| Red Hat Enterprise Linux Workstation (v. 7) | Fixed | RHSA-2019:0622, RHSA-2019:0681 |
| Red Hat Enterprise Linux Workstation Optional (v. 6) | Fixed | RHSA-2019:0623 |
| Red Hat Enterprise Linux Workstation Optional (v. 7) | Fixed | RHSA-2019:0622 |
| Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) | Fixed | RHSA-2019:0622 |
| Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) | Fixed | RHSA-2019:0681 |
Timeline
- 2026-10-02 Threatist record created from CVE-2019-9788
- 2026-10-03 Alias added: GHSA-3fgc-rx9f-4j2g
References
Advisory 6
- https://www.mozilla.org/security/advisories/mfsa2019-07/
- https://www.mozilla.org/security/advisories/mfsa2019-08/
- https://www.mozilla.org/security/advisories/mfsa2019-11/
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=1518001%2C1521304%2C1521214%2C1506665%2C1516834%2C1518774%2C1524755%2C1523362%2C1524214%2C1529203
- RHSA-2019:0966
- RHSA-2019:1144
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-2019-9788 · CVE Program
- CVE-2019-9788 · NVD
- FIRST EPSS
- GHSA-3fgc-rx9f-4j2g · GitHub Advisory Database · CC BY 4.0
- CVE-2019-9788 · 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