Memory corruption in Mozilla Firefox ESR
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 Firefox ESR 52.6. 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 ESR < 52.7 and Thunderbird < 52.7.
Why it matters now
EPSS 0.02964 87th percentileScored 2026-11-07
Fix Fixed Firefox ESR (Mozilla): 52.7Thunderbird (Mozilla): 52.7Red 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 ESR | before 52.7 | 52.7 | Patch available | CNA |
| Mozilla | Thunderbird | before 52.7 | 52.7 | Patch available | CNA |
- Firefox ESR VendorMozilla Affected before 52.7 Fixed in 52.7 Patch available CNA
- Thunderbird VendorMozilla Affected before 52.7 Fixed in 52.7 Patch available CNA
CPE configurations NVD · 21
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:* | 7.0 | Vulnerable | Debian |
| 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: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:7.4:*:*:*:*:*:*:* | 7.4 | 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:7.4:*:*:*:*:*:*:* | 7.4 | Vulnerable | Red Hat |
- cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:* Versions 7.0 Vulnerable ·Debian
- 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: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:7.4:*:*:*:*:*:*:* Versions 7.4 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:7.4:*:*:*:*:*:*:* Versions 7.4 Vulnerable ·Red Hat
Show 11 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| 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:7.4:*:*:*:*:*:*:* | 7.4 | 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:a:mozilla:firefox:*:*:*:*:*:*:*:* | before 52.7.0 | Vulnerable | Mozilla |
| cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* | before 52.7.0 | Vulnerable | Mozilla |
| 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:17.10:*:*:*:*:*:*:* | 17.10 | Vulnerable | Canonical |
- 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:7.4:*:*:*:*:*:*:* Versions 7.4 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
- cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* Versions before 52.7.0 Vulnerable ·Mozilla
- cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* Versions before 52.7.0 Vulnerable ·Mozilla
- 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:17.10:*:*:*:*:*:*:* Versions 17.10 Vulnerable ·Canonical
Remediation
- Fix · CNA Firefox ESR (Mozilla) Fixed in 52.7
- Fix · CNA Thunderbird (Mozilla) Fixed in 52.7
Red Hat 4 advisories
- RHSA-2018:0647 Released 2018-04-05 · Red Hat rating Importantthunderbird security update
- Red Hat Enterprise Linux Desktop (v. 6) thunderbird-52.7.0-1.el6_9
- Red Hat Enterprise Linux Server Optional (v. 6) thunderbird-52.7.0-1.el6_9
- Red Hat Enterprise Linux Workstation (v. 6) thunderbird-52.7.0-1.el6_9
- RHSA-2018:0648 Released 2018-04-05 · Red Hat rating Importantthunderbird security update
- Red Hat Enterprise Linux Client (v. 7) thunderbird-52.7.0-1.el7_4
- Red Hat Enterprise Linux Server Optional (v. 7) thunderbird-52.7.0-1.el7_4
- Red Hat Enterprise Linux Workstation (v. 7) thunderbird-52.7.0-1.el7_4
- Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) thunderbird-52.7.0-1.el7_4
- RHSA-2018:0527 Released 2018-03-15 · Red Hat rating Criticalfirefox security update
- Red Hat Enterprise Linux Client (v. 7) firefox-52.7.0-1.el7_4
- Red Hat Enterprise Linux Client Optional (v. 7) firefox-52.7.0-1.el7_4
- Red Hat Enterprise Linux Server (v. 7) firefox-52.7.0-1.el7_4
- Red Hat Enterprise Linux Server Optional (v. 7) firefox-52.7.0-1.el7_4, firefox-52.7.0-1.el7_4.ppc
- Red Hat Enterprise Linux Workstation (v. 7) firefox-52.7.0-1.el7_4
- Red Hat Enterprise Linux Workstation Optional (v. 7) firefox-52.7.0-1.el7_4
- Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) firefox-52.7.0-1.el7_4
Show 1 more Red Hat advisories
- RHSA-2018:0526 Released 2018-03-15 · Red Hat rating Criticalfirefox security update
- Red Hat Enterprise Linux Desktop (v. 6) firefox-52.7.0-1.el6_9
- Red Hat Enterprise Linux Desktop Optional (v. 6) firefox-52.7.0-1.el6_9
- Red Hat Enterprise Linux HPC Node Optional (v. 6) firefox-52.7.0-1.el6_9
- Red Hat Enterprise Linux Server (v. 6) firefox-52.7.0-1.el6_9
- Red Hat Enterprise Linux Server Optional (v. 6) firefox-52.7.0-1.el6_9, firefox-52.7.0-1.el6_9.ppc
- Red Hat Enterprise Linux Workstation (v. 6) firefox-52.7.0-1.el6_9
- Red Hat Enterprise Linux Workstation Optional (v. 6) firefox-52.7.0-1.el6_9
Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Advisory ·
Mozilla Firefox ESR, Thunderbird — RHSA-2018:0526
7 records Highest priority Priority MEDIUM 5 MEDIUM, 2 LOW
Other records, highest priority first
- TI-2018-03693 Memory corruption in Mozilla ThunderbirdPriority MEDIUM 49
- TI-2018-03696 Improper input validation in Mozilla Firefox ESRPriority MEDIUM 43
- TI-2018-03695 Out-of-bounds write in Mozilla ThunderbirdPriority MEDIUM 43
- Advisory ·
Mozilla Firefox ESR, Thunderbird — RHSA-2018:0527
7 records Highest priority Priority MEDIUM 5 MEDIUM, 2 LOW
Other records, highest priority first
- TI-2018-03693 Memory corruption in Mozilla ThunderbirdPriority MEDIUM 49
- TI-2018-03696 Improper input validation in Mozilla Firefox ESRPriority MEDIUM 43
- TI-2018-03695 Out-of-bounds write in Mozilla ThunderbirdPriority MEDIUM 43
Show 5 more groups
- Advisory ·
Mozilla Firefox ESR, Thunderbird — DSA-4139
7 records Highest priority Priority MEDIUM 5 MEDIUM, 2 LOW
Other records, highest priority first
- TI-2018-03693 Memory corruption in Mozilla ThunderbirdPriority MEDIUM 49
- TI-2018-03696 Improper input validation in Mozilla Firefox ESRPriority MEDIUM 43
- TI-2018-03695 Out-of-bounds write in Mozilla ThunderbirdPriority MEDIUM 43
- Advisory ·
Mozilla Firefox ESR, Thunderbird — RHSA-2018:0647
6 records Highest priority Priority MEDIUM 5 MEDIUM, 1 LOW
Other records, highest priority first
- TI-2018-03711 Out-of-bounds write in Mozilla FirefoxPriority MEDIUM 52
- TI-2018-03693 Memory corruption in Mozilla ThunderbirdPriority MEDIUM 49
- TI-2018-03695 Out-of-bounds write in Mozilla ThunderbirdPriority MEDIUM 43
- Advisory ·
Mozilla Firefox ESR, Thunderbird — RHSA-2018:0648
6 records Highest priority Priority MEDIUM 5 MEDIUM, 1 LOW
Other records, highest priority first
- TI-2018-03711 Out-of-bounds write in Mozilla FirefoxPriority MEDIUM 52
- TI-2018-03693 Memory corruption in Mozilla ThunderbirdPriority MEDIUM 49
- TI-2018-03695 Out-of-bounds write in Mozilla ThunderbirdPriority MEDIUM 43
- Advisory ·
Mozilla Firefox ESR, Thunderbird — USN-3545-1
6 records Highest priority Priority MEDIUM 5 MEDIUM, 1 LOW
Other records, highest priority first
- TI-2018-03711 Out-of-bounds write in Mozilla FirefoxPriority MEDIUM 52
- TI-2018-03693 Memory corruption in Mozilla ThunderbirdPriority MEDIUM 49
- TI-2018-03695 Out-of-bounds write in Mozilla ThunderbirdPriority MEDIUM 43
- Advisory ·
Mozilla Firefox ESR, Thunderbird — DSA-4155
6 records Highest priority Priority MEDIUM 5 MEDIUM, 1 LOW
Other records, highest priority first
- TI-2018-03711 Out-of-bounds write in Mozilla FirefoxPriority MEDIUM 52
- TI-2018-03693 Memory corruption in Mozilla ThunderbirdPriority MEDIUM 49
- TI-2018-03695 Out-of-bounds write in Mozilla ThunderbirdPriority MEDIUM 43
Vendor assessments
Red Hat
Red Hat rating: Critical. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux Client (v. 7) | Fixed | RHSA-2018:0527, RHSA-2018:0648 |
| Red Hat Enterprise Linux Client Optional (v. 7) | Fixed | RHSA-2018:0527 |
| Red Hat Enterprise Linux Desktop (v. 6) | Fixed | RHSA-2018:0526, RHSA-2018:0647 |
| Red Hat Enterprise Linux Desktop Optional (v. 6) | Fixed | RHSA-2018:0526 |
| Red Hat Enterprise Linux HPC Node Optional (v. 6) | Fixed | RHSA-2018:0526 |
| Red Hat Enterprise Linux Server (v. 6) | Fixed | RHSA-2018:0526 |
| Red Hat Enterprise Linux Server (v. 7) | Fixed | RHSA-2018:0527 |
| Red Hat Enterprise Linux Server Optional (v. 6) | Fixed | RHSA-2018:0526, RHSA-2018:0647 |
| Red Hat Enterprise Linux Server Optional (v. 7) | Fixed | RHSA-2018:0527, RHSA-2018:0648 |
| Red Hat Enterprise Linux Workstation (v. 6) | Fixed | RHSA-2018:0526, RHSA-2018:0647 |
| Red Hat Enterprise Linux Workstation (v. 7) | Fixed | RHSA-2018:0527, RHSA-2018:0648 |
| Red Hat Enterprise Linux Workstation Optional (v. 6) | Fixed | RHSA-2018:0526 |
| Red Hat Enterprise Linux Workstation Optional (v. 7) | Fixed | RHSA-2018:0527 |
| Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) | Fixed | RHSA-2018:0527 |
| Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) | Fixed | RHSA-2018:0648 |
Timeline
- 2026-10-02 Threatist record created from CVE-2018-5145
- 2026-10-03 Alias added: GHSA-576m-x596-j6g4
References
Advisory 13
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=1261175%2C1348955
- DSA-4139
- GLSA-201811-13
- RHSA-2018:0527
- USN-3545-1
- [debian-lts-announce] 20180315 [SECURITY] [DLA 1308-1] firefox-esr security update
- https://www.mozilla.org/security/advisories/mfsa2018-09/
- https://www.mozilla.org/security/advisories/mfsa2018-07/
- RHSA-2018:0526
- [debian-lts-announce] 20180329 [SECURITY] [DLA 1327-1] thunderbird security update
- DSA-4155
- RHSA-2018:0648
- RHSA-2018:0647
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-2018-5145 · CVE Program
- CVE-2018-5145 · NVD
- FIRST EPSS
- GHSA-576m-x596-j6g4 · GitHub Advisory Database · CC BY 4.0
- CVE-2018-5145 · Red Hat security data · CC BY 4.0
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