# CVE-2023-34417: Mozilla Firefox and 2 others: Out-of-bounds Write

CVE-2023-34417 is fixed in 5 products on 2 platforms, first by firefox 114.0+build3-0ubuntu0.20.04.1, released June 6, 2023. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2023-34417
- Priority: High
- CVSS: 9.8 (Medium)
- EPSS: 0.0078
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 6, 2023
- Weakness: CWE-787: Out-of-bounds Write
- Vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2023-34417

## Description

Memory safety bugs present in Firefox 113. 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 < 114.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Windows apps | Mozilla Firefox (en-US) | 114.0.1 | [Mozilla Firefox (en-US) 114.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox-114.0.1.md) | Jun 12, 2023 |
| Windows apps | Mozilla Firefox ESR (en-US) | 115.4.0 | [Mozilla Firefox ESR (en-US) 115.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.esr-115.4.0.md) | Oct 17, 2023 |
| Linux | firefox Ubuntu 20.04 LTS (focal) | 114.0+build3-0ubuntu0.20.04.1 | [firefox 114.0+build3-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-firefox-114.0-build3-0ubuntu0.20.04.1.md) | Jun 6, 2023 |
| Linux | firefox-geckodriver Ubuntu 20.04 LTS (focal) | 114.0+build3-0ubuntu0.20.04.1 | [firefox-geckodriver 114.0+build3-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-firefox-geckodriver-114.0-build3-0ubuntu0.20.04.1.md) | Jun 6, 2023 |
| Linux | firefox-mozsymbols Ubuntu 20.04 LTS (focal) | 114.0+build3-0ubuntu0.20.04.1 | [firefox-mozsymbols 114.0+build3-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-firefox-mozsymbols-114.0-build3-0ubuntu0.20.04.1.md) | Jun 6, 2023 |

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Data as of 2026-11-09T07:25:28Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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