Memory corruption in Mozilla Firefox
Priority MEDIUM 47CWE-119Published · 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-119 and the CVSS impact.
Summary
Memory safety bugs were reported in Thunderbird 45.5. 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 Firefox < 50.1, Firefox ESR < 45.6, and Thunderbird < 45.6.
Why it matters now
EPSS 0.0256 85th percentileScored 2026-11-07
Fix Fixed Firefox (Mozilla): 50.1Firefox ESR (Mozilla): 45.6+1 more productRed Hat: 2 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 50.1 | 50.1 | Patch available | CNA |
| Mozilla | Firefox ESR | before 45.6 | 45.6 | Patch available | CNA |
| Mozilla | Thunderbird | before 45.6 | 45.6 | Patch available | CNA |
- Firefox VendorMozilla Affected before 50.1 Fixed in 50.1 Patch available CNA
- Firefox ESR VendorMozilla Affected before 45.6 Fixed in 45.6 Patch available CNA
- Thunderbird VendorMozilla Affected before 45.6 Fixed in 45.6 Patch available CNA
CPE configurations NVD · 20
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* | 9.0 | Vulnerable | Debian |
| cpe:2.3:o:redhat:enterprise_linux:5.0:*:*:*:*:*:*:* | 5.0 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:* | 6.0 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:* | 7.0 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux_desktop:5.0:*:*:*:*:*:*:* | 5.0 | Vulnerable | Red Hat |
| 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:5.0:*:*:*:*:*:*:* | 5.0 | 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:debian:debian_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Debian
- cpe:2.3:o:redhat:enterprise_linux:5.0:*:*:*:*:*:*:* Versions 5.0 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:* Versions 6.0 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:* Versions 7.0 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux_desktop:5.0:*:*:*:*:*:*:* Versions 5.0 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:5.0:*:*:*:*:*:*:* Versions 5.0 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
Show 10 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:redhat:enterprise_linux_server_aus:7.3:*:*:*:*:*:*:* | 7.3 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux_server_aus:7.4:*:*:*:*:*:*:* | 7.4 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux_server_eus:7.3:*:*:*:*:*:*:* | 7.3 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux_server_eus:7.4:*:*:*:*:*:*:* | 7.4 | 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_workstation:5.0:*:*:*:*:*:*:* | 5.0 | 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:a:mozilla:thunderbird:*:*:*:*:*:*:*:* | before 45.6.0 | Vulnerable | Mozilla |
| cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* | before 50.1; before 45.6.0 | Vulnerable | Mozilla |
- cpe:2.3:o:redhat:enterprise_linux_server_aus:7.3:*:*:*:*:*:*:* Versions 7.3 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux_server_aus:7.4:*:*:*:*:*:*:* Versions 7.4 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux_server_eus:7.3:*:*:*:*:*:*:* Versions 7.3 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux_server_eus:7.4:*:*:*:*:*:*:* Versions 7.4 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_workstation:5.0:*:*:*:*:*:*:* Versions 5.0 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
- cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* Versions before 45.6.0 Vulnerable ·Mozilla
- cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* Versions before 50.1; before 45.6.0 Vulnerable ·Mozilla
Remediation
- Fix · CNA Firefox (Mozilla) Fixed in 50.1
- Fix · CNA Firefox ESR (Mozilla) Fixed in 45.6
- Fix · CNA Thunderbird (Mozilla) Fixed in 45.6
Red Hat 2 advisories
- RHSA-2016:2973 Released 2016-12-21 · Red Hat rating Importantthunderbird security update
- Red Hat Enterprise Linux Client (v. 7) thunderbird-45.6.0-1.el7_3
- Red Hat Enterprise Linux Desktop (v. 5 client) thunderbird-45.6.0-1.el5_11, thunderbird-45.6.0-1.el5_11.i386
- Red Hat Enterprise Linux Desktop (v. 6) thunderbird-45.6.0-1.el6_8
- Red Hat Enterprise Linux Optional Productivity Applications (v. 5 server) thunderbird-45.6.0-1.el5_11, thunderbird-45.6.0-1.el5_11.i386
- Red Hat Enterprise Linux Server Optional (v. 6) thunderbird-45.6.0-1.el6_8
- Red Hat Enterprise Linux Server Optional (v. 7) thunderbird-45.6.0-1.el7_3
- Red Hat Enterprise Linux Workstation (v. 6) thunderbird-45.6.0-1.el6_8
- Red Hat Enterprise Linux Workstation (v. 7) thunderbird-45.6.0-1.el7_3
- RHSA-2016:2946 Released 2016-12-14 · Red Hat rating Criticalfirefox security update
- Red Hat Enterprise Linux (v. 5 server) firefox-45.6.0-1.el5_11, firefox-45.6.0-1.el5_11.i386
- Red Hat Enterprise Linux Client (v. 7) firefox-45.6.0-1.el7_3
- Red Hat Enterprise Linux Client Optional (v. 7) firefox-45.6.0-1.el7_3
- Red Hat Enterprise Linux Desktop (v. 5 client) firefox-45.6.0-1.el5_11, firefox-45.6.0-1.el5_11.i386
- Red Hat Enterprise Linux Desktop (v. 6) firefox-45.6.0-1.el6_8
- Red Hat Enterprise Linux Desktop Optional (v. 6) firefox-45.6.0-1.el6_8
- Red Hat Enterprise Linux HPC Node Optional (v. 6) firefox-45.6.0-1.el6_8
- Red Hat Enterprise Linux Server (v. 6) firefox-45.6.0-1.el6_8
- Red Hat Enterprise Linux Server (v. 7) firefox-45.6.0-1.el7_3
- Red Hat Enterprise Linux Server Optional (v. 6) firefox-45.6.0-1.el6_8, firefox-45.6.0-1.el6_8.ppc
- Red Hat Enterprise Linux Server Optional (v. 7) firefox-45.6.0-1.el7_3, firefox-45.6.0-1.el7_3.ppc
- Red Hat Enterprise Linux Workstation (v. 6) firefox-45.6.0-1.el6_8
- Red Hat Enterprise Linux Workstation (v. 7) firefox-45.6.0-1.el7_3
- Red Hat Enterprise Linux Workstation Optional (v. 6) firefox-45.6.0-1.el6_8
- Red Hat Enterprise Linux Workstation Optional (v. 7) firefox-45.6.0-1.el7_3
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 — RHSA-2016:2946
10 records Highest priority Priority MEDIUM 6 MEDIUM, 4 LOW
Other records, highest priority first
- TI-2016-08019 Use after free in Mozilla FirefoxPriority MEDIUM 61
- TI-2016-08018 Use after free in Mozilla FirefoxPriority MEDIUM 48
- TI-2016-08021 Improper input validation in Mozilla Firefox ESRPriority MEDIUM 47
- Advisory ·
Mozilla Firefox, Firefox ESR, Thunderbird — DSA-3757
8 records Highest priority Priority MEDIUM 5 MEDIUM, 3 LOW
Other records, highest priority first
- TI-2016-08019 Use after free in Mozilla FirefoxPriority MEDIUM 61
- TI-2016-08018 Use after free in Mozilla FirefoxPriority MEDIUM 48
- TI-2016-08020 External resources that should be blocked when loaded by SVG images can bypass security…Priority MEDIUM 45
Show 1 more group
- Advisory ·
Mozilla Firefox, Firefox ESR, Thunderbird — RHSA-2016:2973
7 records Highest priority Priority MEDIUM 5 MEDIUM, 2 LOW
Other records, highest priority first
- TI-2016-08019 Use after free in Mozilla FirefoxPriority MEDIUM 61
- TI-2016-08021 Improper input validation in Mozilla Firefox ESRPriority MEDIUM 47
- TI-2016-08020 External resources that should be blocked when loaded by SVG images can bypass security…Priority MEDIUM 45
Vendor assessments
Red Hat
Red Hat rating: Critical. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux (v. 5 server) | Fixed | RHSA-2016:2946 |
| Red Hat Enterprise Linux Client (v. 7) | Fixed | RHSA-2016:2946, RHSA-2016:2973 |
| Red Hat Enterprise Linux Client Optional (v. 7) | Fixed | RHSA-2016:2946 |
| Red Hat Enterprise Linux Desktop (v. 5 client) | Fixed | RHSA-2016:2946, RHSA-2016:2973 |
| Red Hat Enterprise Linux Desktop (v. 6) | Fixed | RHSA-2016:2946, RHSA-2016:2973 |
| Red Hat Enterprise Linux Desktop Optional (v. 6) | Fixed | RHSA-2016:2946 |
| Red Hat Enterprise Linux HPC Node Optional (v. 6) | Fixed | RHSA-2016:2946 |
| Red Hat Enterprise Linux Optional Productivity Applications (v. 5 server) | Fixed | RHSA-2016:2973 |
| Red Hat Enterprise Linux Server (v. 6) | Fixed | RHSA-2016:2946 |
| Red Hat Enterprise Linux Server (v. 7) | Fixed | RHSA-2016:2946 |
| Red Hat Enterprise Linux Server Optional (v. 6) | Fixed | RHSA-2016:2946, RHSA-2016:2973 |
| Red Hat Enterprise Linux Server Optional (v. 7) | Fixed | RHSA-2016:2946, RHSA-2016:2973 |
| Red Hat Enterprise Linux Workstation (v. 6) | Fixed | RHSA-2016:2946, RHSA-2016:2973 |
| Red Hat Enterprise Linux Workstation (v. 7) | Fixed | RHSA-2016:2946, RHSA-2016:2973 |
| Red Hat Enterprise Linux Workstation Optional (v. 6) | Fixed | RHSA-2016:2946 |
| Red Hat Enterprise Linux Workstation Optional (v. 7) | Fixed | RHSA-2016:2946 |
Timeline
- 2026-10-02 Threatist record created from CVE-2016-9893
- 2026-10-03 Alias added: GHSA-c8hw-wjgm-chwm
References
Advisory 8
- https://www.mozilla.org/security/advisories/mfsa2016-94/
- https://www.mozilla.org/security/advisories/mfsa2016-95/
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=1319524%2C1298773%2C1299098%2C1309834%2C1312609%2C1313212%2C1317805%2C1312548%2C1315631%2C1287912
- GLSA-201701-15
- DSA-3757
- RHSA-2016:2973
- https://www.mozilla.org/security/advisories/mfsa2016-96/
- RHSA-2016:2946
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-2016-9893 · CVE Program
- CVE-2016-9893 · NVD
- FIRST EPSS
- GHSA-c8hw-wjgm-chwm · GitHub Advisory Database · CC BY 4.0
- CVE-2016-9893 · Red Hat security data · CC BY 4.0
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