Memory corruption in Mozilla Firefox
Priority MEDIUM 48CWE-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 56 and Firefox ESR 52.4. 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 < 57, Firefox ESR < 52.5, and Thunderbird < 52.5.
Why it matters now
EPSS 0.03335 88th percentileScored 2026-11-07
Fix Fixed Firefox (Mozilla): 57Firefox ESR (Mozilla): 52.5+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 57 | 57 | Patch available | CNA |
| Mozilla | Firefox ESR | before 52.5 | 52.5 | Patch available | CNA |
| Mozilla | Thunderbird | before 52.5 | 52.5 | Patch available | CNA |
- Firefox VendorMozilla Affected before 57 Fixed in 57 Patch available CNA
- Firefox ESR VendorMozilla Affected before 52.5 Fixed in 52.5 Patch available CNA
- Thunderbird VendorMozilla Affected before 52.5 Fixed in 52.5 Patch available CNA
CPE configurations NVD · 16
| 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_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: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_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
Show 6 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| 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:canonical:ubuntu_linux:17.10:*:*:*:*:*:*:* | 17.10 | Vulnerable | Canonical |
| cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* | 18.04 | Vulnerable | Canonical |
| cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* | before 57.0; before 52.5.0 | Vulnerable | Mozilla |
| cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* | before 52.5.0 | Vulnerable | Mozilla |
- 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:o:canonical:ubuntu_linux:17.10:*:*:*:*:*:*:* Versions 17.10 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 57.0; before 52.5.0 Vulnerable ·Mozilla
- cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* Versions before 52.5.0 Vulnerable ·Mozilla
Remediation
- Fix · CNA Firefox (Mozilla) Fixed in 57
- Fix · CNA Firefox ESR (Mozilla) Fixed in 52.5
- Fix · CNA Thunderbird (Mozilla) Fixed in 52.5
Red Hat 2 advisories
- RHSA-2017:3372 Released 2017-12-04 · Red Hat rating Importantthunderbird security update
- Red Hat Enterprise Linux Client (v. 7) thunderbird-52.5.0-1.el7_4
- Red Hat Enterprise Linux Desktop (v. 6) thunderbird-52.5.0-1.el6_9
- Red Hat Enterprise Linux Server Optional (v. 6) thunderbird-52.5.0-1.el6_9
- Red Hat Enterprise Linux Server Optional (v. 7) thunderbird-52.5.0-1.el7_4
- Red Hat Enterprise Linux Workstation (v. 6) thunderbird-52.5.0-1.el6_9
- Red Hat Enterprise Linux Workstation (v. 7) thunderbird-52.5.0-1.el7_4
- Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) thunderbird-52.5.0-1.el7_4
- RHSA-2017:3247 Released 2017-11-17 · Red Hat rating Criticalfirefox security update
- Red Hat Enterprise Linux Client (v. 7) firefox-52.5.0-1.el7_4
- Red Hat Enterprise Linux Client Optional (v. 7) firefox-52.5.0-1.el7_4
- Red Hat Enterprise Linux Desktop (v. 6) firefox-52.5.0-1.el6_9
- Red Hat Enterprise Linux Desktop Optional (v. 6) firefox-52.5.0-1.el6_9
- Red Hat Enterprise Linux HPC Node Optional (v. 6) firefox-52.5.0-1.el6_9
- Red Hat Enterprise Linux Server (v. 6) firefox-52.5.0-1.el6_9
- Red Hat Enterprise Linux Server (v. 7) firefox-52.5.0-1.el7_4
- Red Hat Enterprise Linux Server Optional (v. 6) firefox-52.5.0-1.el6_9, firefox-52.5.0-1.el6_9.ppc
- Red Hat Enterprise Linux Server Optional (v. 7) firefox-52.5.0-1.el7_4, firefox-52.5.0-1.el7_4.ppc
- Red Hat Enterprise Linux Workstation (v. 6) firefox-52.5.0-1.el6_9
- Red Hat Enterprise Linux Workstation (v. 7) firefox-52.5.0-1.el7_4
- Red Hat Enterprise Linux Workstation Optional (v. 6) firefox-52.5.0-1.el6_9
- Red Hat Enterprise Linux Workstation Optional (v. 7) firefox-52.5.0-1.el7_4
- Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) firefox-52.5.0-1.el7_4
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 — DSA-4075
7 records Highest priority Priority MEDIUM 3 MEDIUM, 4 LOW
Other records, highest priority first
- TI-2017-05445 Use after free in Mozilla FirefoxPriority MEDIUM 52
- TI-2017-05462 Injection in Mozilla ThunderbirdPriority MEDIUM 42
- TI-2017-05447 The Resource Timing API incorrectly revealed navigations in cross-origin iframes.Priority LOW 33
- Advisory ·
Mozilla Firefox, Firefox ESR, Thunderbird — USN-3688-1
5 records Highest priority Priority MEDIUM 5 MEDIUM
Other records, highest priority first
- TI-2018-03714 Memory corruption in Mozilla ThunderbirdPriority MEDIUM 48
- TI-2018-03656 Memory corruption in Mozilla ThunderbirdPriority MEDIUM 48
- TI-2017-05427 Memory corruption in Mozilla FirefoxPriority MEDIUM 47
Show 4 more groups
- Advisory ·
Mozilla Firefox, Firefox ESR, Thunderbird — RHSA-2017:3247
3 records Highest priority Priority MEDIUM 2 MEDIUM, 1 LOW
Other records, highest priority first
- TI-2017-05445 Use after free in Mozilla FirefoxPriority MEDIUM 52
- TI-2017-05447 The Resource Timing API incorrectly revealed navigations in cross-origin iframes.Priority LOW 33
- Advisory ·
Mozilla Firefox, Firefox ESR, Thunderbird — RHSA-2017:3372
3 records Highest priority Priority MEDIUM 2 MEDIUM, 1 LOW
Other records, highest priority first
- TI-2017-05445 Use after free in Mozilla FirefoxPriority MEDIUM 52
- TI-2017-05447 The Resource Timing API incorrectly revealed navigations in cross-origin iframes.Priority LOW 33
- Advisory ·
Mozilla Firefox, Firefox ESR, Thunderbird — DSA-4035
3 records Highest priority Priority MEDIUM 2 MEDIUM, 1 LOW
Other records, highest priority first
- TI-2017-05445 Use after free in Mozilla FirefoxPriority MEDIUM 52
- TI-2017-05447 The Resource Timing API incorrectly revealed navigations in cross-origin iframes.Priority LOW 33
- Advisory ·
Mozilla Firefox, Firefox ESR, Thunderbird — DSA-4061
3 records Highest priority Priority MEDIUM 2 MEDIUM, 1 LOW
Other records, highest priority first
- TI-2017-05445 Use after free in Mozilla FirefoxPriority MEDIUM 52
- TI-2017-05447 The Resource Timing API incorrectly revealed navigations in cross-origin iframes.Priority LOW 33
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-2017:3247, RHSA-2017:3372 |
| Red Hat Enterprise Linux Client Optional (v. 7) | Fixed | RHSA-2017:3247 |
| Red Hat Enterprise Linux Desktop (v. 6) | Fixed | RHSA-2017:3247, RHSA-2017:3372 |
| Red Hat Enterprise Linux Desktop Optional (v. 6) | Fixed | RHSA-2017:3247 |
| Red Hat Enterprise Linux HPC Node Optional (v. 6) | Fixed | RHSA-2017:3247 |
| Red Hat Enterprise Linux Server (v. 6) | Fixed | RHSA-2017:3247 |
| Red Hat Enterprise Linux Server (v. 7) | Fixed | RHSA-2017:3247 |
| Red Hat Enterprise Linux Server Optional (v. 6) | Fixed | RHSA-2017:3247, RHSA-2017:3372 |
| Red Hat Enterprise Linux Server Optional (v. 7) | Fixed | RHSA-2017:3247, RHSA-2017:3372 |
| Red Hat Enterprise Linux Workstation (v. 6) | Fixed | RHSA-2017:3247, RHSA-2017:3372 |
| Red Hat Enterprise Linux Workstation (v. 7) | Fixed | RHSA-2017:3247, RHSA-2017:3372 |
| Red Hat Enterprise Linux Workstation Optional (v. 6) | Fixed | RHSA-2017:3247 |
| Red Hat Enterprise Linux Workstation Optional (v. 7) | Fixed | RHSA-2017:3247 |
| Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) | Fixed | RHSA-2017:3247 |
| Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) | Fixed | RHSA-2017:3372 |
Timeline
- 2026-10-02 Threatist record created from CVE-2017-7826
- 2026-10-03 Alias added: GHSA-9g7r-5p3c-g4qg
References
Advisory 12
- [debian-lts-announce] 20171209 [SECURITY] [DLA 1199-1] thunderbird security update
- DSA-4035
- https://www.mozilla.org/security/advisories/mfsa2017-24/
- https://www.mozilla.org/security/advisories/mfsa2017-25/
- https://www.mozilla.org/security/advisories/mfsa2017-26/
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=1394530%2C1369561%2C1411458%2C1400003%2C1395138%2C1408412%2C1393840%2C1400763%2C1339259%2C1394265%2C1407740%2C1407751%2C1408005%2C1406398%2C1387799%2C1261175%2C1400554%2C1375146%2C1397811%2C1404636%2C1401804
- DSA-4061
- [debian-lts-announce] 20171115 [SECURITY] [DLA 1172-1] firefox-esr security update
- RHSA-2017:3247
- DSA-4075
- USN-3688-1
- RHSA-2017:3372
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-2017-7826 · CVE Program
- CVE-2017-7826 · NVD
- FIRST EPSS
- GHSA-9g7r-5p3c-g4qg · GitHub Advisory Database · CC BY 4.0
- CVE-2017-7826 · 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