--- title: "CVE-2018-12376\n | Ubuntu" description: Ubuntu is an open source software operating system that runs from the desktop, to the cloud, to all your internet connected things. url: https://ubuntu.com/security/CVE-2018-12376?format=md keywords: index, follow --- # CVE-2018-12376 Publication date 6 September 2018 Last updated 25 August 2025 --- Ubuntu priority **Medium** [Why this priority?](https://ubuntu.com/security/cves/about#priority ) ## Cvss 3 Severity Score **9.8 · Critical** [Score breakdown](https://ubuntu.com/security/CVE-2018-12376?format=md#impact-score) Toggle side navigation ## Description Memory safety bugs present in Firefox 61 and Firefox ESR 60.1. 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 < 62, Firefox ESR < 60.2, and Thunderbird < 60.2.1. [Read the notes from the security team](https://ubuntu.com/security/CVE-2018-12376?format=md#notes) ## Status Show unmaintained releases | Package | Ubuntu Release | Status | | --- | --- | --- | | firefox | 24.04 LTS noble | Fixed 62.0+build2-0ubuntu1 | | 23.10 mantic | Fixed 62.0+build2-0ubuntu1 | | 23.04 lunar | Fixed 62.0+build2-0ubuntu1 | | 22.10 kinetic | Fixed 62.0+build2-0ubuntu1 | | 22.04 LTS jammy | Fixed 62.0+build2-0ubuntu1 | | 21.10 impish | Fixed 62.0+build2-0ubuntu1 | | 21.04 hirsute | Fixed 62.0+build2-0ubuntu1 | | 20.10 groovy | Fixed 62.0+build2-0ubuntu1 | | 20.04 LTS focal | Fixed 62.0+build2-0ubuntu1 | | 19.10 eoan | Fixed 62.0+build2-0ubuntu1 | | 19.04 disco | Fixed 62.0+build2-0ubuntu1 | | 18.10 cosmic | Fixed 62.0+build2-0ubuntu1 | | 18.04 LTS bionic | Fixed 62.0+build2-0ubuntu0.18.04.3 | | 16.04 LTS xenial | Fixed 62.0+build2-0ubuntu0.16.04.3 | | 14.04 LTS trusty | Fixed 62.0+build2-0ubuntu0.14.04.3 | | firefox-esr | 24.04 LTS noble | Not in release | | 23.10 mantic | Not in release | | 23.04 lunar | Not in release | | 22.10 kinetic | Not in release | | 22.04 LTS jammy | Not in release | | 21.10 impish | Not in release | | 21.04 hirsute | Not in release | | 20.10 groovy | Not in release | | 20.04 LTS focal | Not in release | | 19.10 eoan | Not in release | | 19.04 disco | Not in release | | 18.10 cosmic | Not in release | | 18.04 LTS bionic | Not in release | | 16.04 LTS xenial | Not in release | | 14.04 LTS trusty | Not in release | | mozjs38 | 24.04 LTS noble | Not in release | | 23.10 mantic | Not in release | | 23.04 lunar | Not in release | | 22.10 kinetic | Not in release | | 22.04 LTS jammy | Not in release | | 21.10 impish | Not in release | | 21.04 hirsute | Not in release | | 20.10 groovy | Not in release | | 20.04 LTS focal | Not in release | | 19.10 eoan | Not in release | | 19.04 disco | Not in release | | 18.10 cosmic | Not in release | | 18.04 LTS bionic | Ignored | | 16.04 LTS xenial | Not in release | | 14.04 LTS trusty | Not in release | | mozjs52 | 24.04 LTS noble | Not in release | | 23.10 mantic | Not in release | | 23.04 lunar | Not in release | | 22.10 kinetic | Not in release | | 22.04 LTS jammy | Not in release | | 21.10 impish | Not in release | | 21.04 hirsute | Not in release | | 20.10 groovy | Ignored end of life | | 20.04 LTS focal | Ignored | | 19.10 eoan | Ignored end of life | | 19.04 disco | Ignored end of life | | 18.10 cosmic | Ignored end of life | | 18.04 LTS bionic | Ignored | | 16.04 LTS xenial | Not in release | | 14.04 LTS trusty | Not in release | | thunderbird | 24.04 LTS noble | Fixed 1:60.2.1+build1-0ubuntu1 | | 23.10 mantic | Fixed 1:60.2.1+build1-0ubuntu1 | | 23.04 lunar | Fixed 1:60.2.1+build1-0ubuntu1 | | 22.10 kinetic | Fixed 1:60.2.1+build1-0ubuntu1 | | 22.04 LTS jammy | Fixed 1:60.2.1+build1-0ubuntu1 | | 21.10 impish | Fixed 1:60.2.1+build1-0ubuntu1 | | 21.04 hirsute | Fixed 1:60.2.1+build1-0ubuntu1 | | 20.10 groovy | Fixed 1:60.2.1+build1-0ubuntu1 | | 20.04 LTS focal | Fixed 1:60.2.1+build1-0ubuntu1 | | 19.10 eoan | Fixed 1:60.2.1+build1-0ubuntu1 | | 19.04 disco | Fixed 1:60.2.1+build1-0ubuntu1 | | 18.10 cosmic | Fixed 1:60.2.1+build1-0ubuntu1 | | 18.04 LTS bionic | Fixed 1:60.2.1+build1-0ubuntu0.18.04.2 | | 16.04 LTS xenial | Fixed 1:60.2.1+build1-0ubuntu0.16.04.4 | | 14.04 LTS trusty | Fixed 1:60.2.1+build1-0ubuntu0.14.04.2 | --- * [How can I get the fixes?](https://ubuntu.com/security/cves/about#security) * [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses) ## Notes --- ### [tyhicks](https://launchpad.net/~tyhicks) mozjs contains a copy of the SpiderMonkey JavaScript engine ## Severity score breakdown CVSS version: CVSS v3.0 **Base score** 9.8 · Critical * Base metrics | Parameter | Value | | --- | --- | | Attack vector | Network | | Attack complexity | Low | | Privileges required | None | | User interaction | None | | Scope | Unchanged | | Confidentiality impact | High | | Integrity impact | High | | Availability impact | High | * Scores | Parameter | Value | | --- | --- | | Base score | 9.8 · Critical | | Exploitability score | - | | Impact score | - | **Vector:** CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H ## References * [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-12376) * [NVD](https://nvd.nist.gov/vuln/detail/CVE-2018-12376) * [Launchpad](https://launchpad.net/bugs/cve/CVE-2018-12376) * [Debian](https://security-tracker.debian.org/tracker/CVE-2018-12376) ### Related Ubuntu Security Notices (USN) + [USN-3761-1](https://usn.ubuntu.com/USN-3761-1) + Firefox vulnerabilities + 6 September 2018 + [USN-3793-1](https://usn.ubuntu.com/USN-3793-1) + Thunderbird vulnerabilities + 15 October 2018 ### Other references * * * *