Out-of-bounds write in Mozilla Firefox
Priority MEDIUM 52CWE-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
- Partial Red Hat: 17 fixed, 1 without a fix
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat. Impact type from CWE-787 and the CVSS impact.
Summary
Memory safety bugs present in Firefox 117, Firefox ESR 115.2, and Thunderbird 115.2. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 118, Firefox ESR < 115.3, and Thunderbird < 115.3.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.01388 72nd percentileScored 2026-11-07
Fix Partial Firefox (Mozilla): 118Firefox ESR (Mozilla): 115.3+1 more productRed Hat: 16 advisoriesRed Hat: 17 fixed, 1 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Mozilla | Firefox | before 118 | 118 | Patch available | CNA |
| Mozilla | Firefox ESR | before 115.3 | 115.3 | Patch available | CNA |
| Mozilla | Thunderbird | before 115.3 | 115.3 | Patch available | CNA |
- Firefox VendorMozilla Affected before 118 Fixed in 118 Patch available CNA
- Firefox ESR VendorMozilla Affected before 115.3 Fixed in 115.3 Patch available CNA
- Thunderbird VendorMozilla Affected before 115.3 Fixed in 115.3 Patch available CNA
CPE configurations NVD · 6
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* | before 118 | Vulnerable | Mozilla |
| cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:* | before 115.3 | Vulnerable | Mozilla |
| cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* | before 115.3 | Vulnerable | Mozilla |
| cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* | 10.0 | Vulnerable | Debian |
| cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* | 11.0 | Vulnerable | Debian |
| cpe:2.3:o:debian:debian_linux:12.0:*:*:*:*:*:*:* | 12.0 | Vulnerable | Debian |
- cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* Versions before 118 Vulnerable ·Mozilla
- cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:* Versions before 115.3 Vulnerable ·Mozilla
- cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* Versions before 115.3 Vulnerable ·Mozilla
- cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* Versions 10.0 Vulnerable ·Debian
- cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* Versions 11.0 Vulnerable ·Debian
- cpe:2.3:o:debian:debian_linux:12.0:*:*:*:*:*:*:* Versions 12.0 Vulnerable ·Debian
Remediation
- Fix · CNA Firefox (Mozilla) Fixed in 118
- Fix · CNA Firefox ESR (Mozilla) Fixed in 115.3
- Fix · CNA Thunderbird (Mozilla) Fixed in 115.3
Red Hat 16 advisories
- RHSA-2023:5475 Released 2023-10-05 · Red Hat rating Importantthunderbird security update
- Red Hat Enterprise Linux Client (v. 7) thunderbird-115.3.1-1.el7_9
- Red Hat Enterprise Linux Server Optional (v. 7) thunderbird-115.3.1-1.el7_9
- Red Hat Enterprise Linux Workstation (v. 7) thunderbird-115.3.1-1.el7_9
- RHSA-2023:5477 Released 2023-10-05 · Red Hat rating Importantfirefox security update
- Red Hat Enterprise Linux Client (v. 7) firefox-115.3.1-1.el7_9
- Red Hat Enterprise Linux Client Optional (v. 7) firefox-115.3.1-1.el7_9
- Red Hat Enterprise Linux Server (v. 7) firefox-115.3.1-1.el7_9
- Red Hat Enterprise Linux Server Optional (v. 7) firefox-115.3.1-1.el7_9
- Red Hat Enterprise Linux Workstation (v. 7) firefox-115.3.1-1.el7_9
- Red Hat Enterprise Linux Workstation Optional (v. 7) firefox-115.3.1-1.el7_9
- RHSA-2023:5429 Released 2023-10-04 · Red Hat rating Importantthunderbird security update
- Red Hat Enterprise Linux AppStream AUS (v.8.4) thunderbird-115.3.1-1.el8_4
- Red Hat Enterprise Linux AppStream E4S (v.8.4) thunderbird-115.3.1-1.el8_4
- Red Hat Enterprise Linux AppStream TUS (v.8.4) thunderbird-115.3.1-1.el8_4
Show 13 more Red Hat advisories
- RHSA-2023:5434 Released 2023-10-04 · Red Hat rating Importantfirefox security update
- Red Hat Enterprise Linux AppStream (v. 9) firefox-115.3.1-1.el9_2, firefox-x11-115.3.1-1.el9_2
- RHSA-2023:5438 Released 2023-10-04 · Red Hat rating Importantthunderbird security update
- Red Hat Enterprise Linux AppStream E4S (v. 8.1) thunderbird-115.3.1-1.el8_1
- RHSA-2023:5426 Released 2023-10-04 · Red Hat rating Importantfirefox security update
- Red Hat Enterprise Linux AppStream AUS (v. 8.2) firefox-115.3.1-1.el8_2
- Red Hat Enterprise Linux AppStream E4S (v. 8.2) firefox-115.3.1-1.el8_2
- Red Hat Enterprise Linux AppStream TUS (v. 8.2) firefox-115.3.1-1.el8_2
- RHSA-2023:5432 Released 2023-10-04 · Red Hat rating Importantthunderbird security update
- Red Hat Enterprise Linux AppStream AUS (v. 8.2) thunderbird-115.3.1-1.el8_2
- Red Hat Enterprise Linux AppStream E4S (v. 8.2) thunderbird-115.3.1-1.el8_2
- Red Hat Enterprise Linux AppStream TUS (v. 8.2) thunderbird-115.3.1-1.el8_2
- RHSA-2023:5433 Released 2023-10-04 · Red Hat rating Importantfirefox security update
- Red Hat Enterprise Linux AppStream (v. 8) firefox-115.3.1-1.el8_8
- RHSA-2023:5437 Released 2023-10-04 · Red Hat rating Importantfirefox security update
- Red Hat Enterprise Linux AppStream AUS (v.8.4) firefox-115.3.1-1.el8_4
- Red Hat Enterprise Linux AppStream E4S (v.8.4) firefox-115.3.1-1.el8_4
- Red Hat Enterprise Linux AppStream TUS (v.8.4) firefox-115.3.1-1.el8_4
- RHSA-2023:5440 Released 2023-10-04 · Red Hat rating Importantfirefox security update
- Red Hat Enterprise Linux AppStream E4S (v. 8.1) firefox-115.3.1-1.el8_1
- RHSA-2023:5439 Released 2023-10-04 · Red Hat rating Importantthunderbird security update
- Red Hat Enterprise Linux AppStream EUS (v.9.0) thunderbird-115.3.1-1.el9_0
- RHSA-2023:5436 Released 2023-10-04 · Red Hat rating Importantfirefox security update
- Red Hat Enterprise Linux AppStream EUS (v.8.6) firefox-115.3.1-1.el8_6
- RHSA-2023:5435 Released 2023-10-04 · Red Hat rating Importantthunderbird security update
- Red Hat Enterprise Linux AppStream (v. 9) thunderbird-115.3.1-1.el9_2
- RHSA-2023:5430 Released 2023-10-04 · Red Hat rating Importantthunderbird security update
- Red Hat Enterprise Linux AppStream EUS (v.8.6) thunderbird-115.3.1-1.el8_6
- RHSA-2023:5428 Released 2023-10-04 · Red Hat rating Importantthunderbird security update
- Red Hat Enterprise Linux AppStream (v. 8) thunderbird-115.3.1-1.el8_8
- RHSA-2023:5427 Released 2023-10-04 · Red Hat rating Importantfirefox security update
- Red Hat Enterprise Linux AppStream EUS (v.9.0) firefox-115.3.1-1.el9_0
Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Release ·
Mozilla Firefox 118
9 records Highest priority Priority MEDIUM 5 MEDIUM, 4 LOW
Other records, highest priority first
- TI-2023-04763 Use after free in Mozilla FirefoxPriority MEDIUM 51
- TI-2023-04762 Use after free in Mozilla FirefoxPriority MEDIUM 51
- TI-2023-04760 Use after free in Mozilla FirefoxPriority MEDIUM 51
- Release ·
Mozilla Firefox ESR, Thunderbird 115.3
5 records Highest priority Priority MEDIUM 3 MEDIUM, 2 LOW
Other records, highest priority first
- TI-2023-04762 Use after free in Mozilla FirefoxPriority MEDIUM 51
- TI-2023-04756 Out-of-bounds write in Mozilla FirefoxPriority MEDIUM 51
- TI-2023-04759 Use after free in Mozilla FirefoxPriority LOW 31
Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux AppStream (v. 8) | Fixed | RHSA-2023:5428, RHSA-2023:5433 |
| Red Hat Enterprise Linux AppStream (v. 9) | Fixed | RHSA-2023:5434, RHSA-2023:5435 |
| Red Hat Enterprise Linux AppStream AUS (v. 8.2) | Fixed | RHSA-2023:5426, RHSA-2023:5432 |
| Red Hat Enterprise Linux AppStream AUS (v.8.4) | Fixed | RHSA-2023:5429, RHSA-2023:5437 |
| Red Hat Enterprise Linux AppStream E4S (v. 8.1) | Fixed | RHSA-2023:5438, RHSA-2023:5440 |
| Red Hat Enterprise Linux AppStream E4S (v. 8.2) | Fixed | RHSA-2023:5426, RHSA-2023:5432 |
| Red Hat Enterprise Linux AppStream E4S (v.8.4) | Fixed | RHSA-2023:5429, RHSA-2023:5437 |
| Red Hat Enterprise Linux AppStream EUS (v.8.6) | Fixed | RHSA-2023:5430, RHSA-2023:5436 |
| Red Hat Enterprise Linux AppStream EUS (v.9.0) | Fixed | RHSA-2023:5427, RHSA-2023:5439 |
| Red Hat Enterprise Linux AppStream TUS (v. 8.2) | Fixed | RHSA-2023:5426, RHSA-2023:5432 |
| Red Hat Enterprise Linux AppStream TUS (v.8.4) | Fixed | RHSA-2023:5429, RHSA-2023:5437 |
| Red Hat Enterprise Linux Client (v. 7) | Fixed | RHSA-2023:5475, RHSA-2023:5477 |
| Red Hat Enterprise Linux Client Optional (v. 7) | Fixed | RHSA-2023:5477 |
| Red Hat Enterprise Linux Server (v. 7) | Fixed | RHSA-2023:5477 |
| Red Hat Enterprise Linux Server Optional (v. 7) | Fixed | RHSA-2023:5475, RHSA-2023:5477 |
| Red Hat Enterprise Linux Workstation (v. 7) | Fixed | RHSA-2023:5475, RHSA-2023:5477 |
| Red Hat Enterprise Linux Workstation Optional (v. 7) | Fixed | RHSA-2023:5477 |
Timeline
- 2026-10-02 Threatist record created from CVE-2023-5176
- 2026-10-03 Alias added: GHSA-238m-xccf-m2f6
References
Advisory 7
- https://www.mozilla.org/security/advisories/mfsa2023-41/
- https://www.mozilla.org/security/advisories/mfsa2023-42/
- https://www.mozilla.org/security/advisories/mfsa2023-43/
- https://www.debian.org/security/2023/dsa-5506
- https://lists.debian.org/debian-lts-announce/2023/09/msg00034.html
- https://www.debian.org/security/2023/dsa-5513
- https://lists.debian.org/debian-lts-announce/2023/10/msg00015.html
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-2023-5176 · CVE Program
- CVE-2023-5176 · NVD
- FIRST EPSS
- GHSA-238m-xccf-m2f6 · GitHub Advisory Database · CC BY 4.0
- CVE-2023-5176 · 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