--- title: "CVE-2019-9793\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-2019-9793?format=md keywords: index, follow --- # CVE-2019-9793 Publication date 20 March 2019 Last updated 25 August 2025 --- Ubuntu priority **Medium** [Why this priority?](https://ubuntu.com/security/cves/about#priority ) ## Cvss 3 Severity Score **5.9 · Medium** [Score breakdown](https://ubuntu.com/security/CVE-2019-9793?format=md#impact-score) Toggle side navigation ## Description A mechanism was discovered that removes some bounds checking for string, array, or typed array accesses if Spectre mitigations have been disabled. This vulnerability could allow an attacker to create an arbitrary value in compiled JavaScript, for which the range analysis will infer a fully controlled, incorrect range in circumstances where users have explicitly disabled Spectre mitigations. \*Note: Spectre mitigations are currently enabled for all users by default settings.\*. This vulnerability affects Thunderbird < 60.6, Firefox ESR < 60.6, and Firefox < 66. [Read the notes from the security team](https://ubuntu.com/security/CVE-2019-9793?format=md#notes) ## Status Show unmaintained releases | Package | Ubuntu Release | Status | | --- | --- | --- | | firefox | 24.04 LTS noble | Fixed 66.0+build3-0ubuntu1 | | 23.10 mantic | Fixed 66.0+build3-0ubuntu1 | | 23.04 lunar | Fixed 66.0+build3-0ubuntu1 | | 22.10 kinetic | Fixed 66.0+build3-0ubuntu1 | | 22.04 LTS jammy | Fixed 66.0+build3-0ubuntu1 | | 21.10 impish | Fixed 66.0+build3-0ubuntu1 | | 21.04 hirsute | Fixed 66.0+build3-0ubuntu1 | | 20.10 groovy | Fixed 66.0+build3-0ubuntu1 | | 20.04 LTS focal | Fixed 66.0+build3-0ubuntu1 | | 19.10 eoan | Fixed 66.0+build3-0ubuntu1 | | 19.04 disco | Fixed 66.0+build3-0ubuntu1 | | 18.10 cosmic | Fixed 66.0+build3-0ubuntu0.18.10.1 | | 18.04 LTS bionic | Fixed 66.0+build3-0ubuntu0.18.04.1 | | 16.04 LTS xenial | Fixed 66.0+build3-0ubuntu0.16.04.2 | | 14.04 LTS trusty | Fixed 66.0.1+build1-0ubuntu0.14.04.1 | | 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 | | mozjs60 | 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 | Ignored end of life | | 19.04 disco | Ignored end of life | | 18.10 cosmic | Ignored end of life | | 18.04 LTS bionic | Not in release | | 16.04 LTS xenial | Not in release | | 14.04 LTS trusty | Not in release | | thunderbird | 24.04 LTS noble | Fixed 60.6.1+build2-0ubuntu1 | | 23.10 mantic | Fixed 60.6.1+build2-0ubuntu1 | | 23.04 lunar | Fixed 60.6.1+build2-0ubuntu1 | | 22.10 kinetic | Fixed 60.6.1+build2-0ubuntu1 | | 22.04 LTS jammy | Fixed 60.6.1+build2-0ubuntu1 | | 21.10 impish | Fixed 60.6.1+build2-0ubuntu1 | | 21.04 hirsute | Fixed 60.6.1+build2-0ubuntu1 | | 20.10 groovy | Fixed 60.6.1+build2-0ubuntu1 | | 20.04 LTS focal | Fixed 60.6.1+build2-0ubuntu1 | | 19.10 eoan | Fixed 60.6.1+build2-0ubuntu1 | | 19.04 disco | Fixed 60.6.1+build2-0ubuntu1 | | 18.10 cosmic | Fixed 1:60.6.1+build2-0ubuntu0.18.10.1 | | 18.04 LTS bionic | Fixed 1:60.6.1+build2-0ubuntu0.18.04.1 | | 16.04 LTS xenial | Fixed 1:60.6.1+build2-0ubuntu0.16.04.1 | | 14.04 LTS trusty | Fixed 1:60.6.1+build2-0ubuntu0.14.04.1 | --- * [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** 5.9 · Medium * Base metrics | Parameter | Value | | --- | --- | | Attack vector | Network | | Attack complexity | High | | Privileges required | None | | User interaction | None | | Scope | Unchanged | | Confidentiality impact | None | | Integrity impact | High | | Availability impact | None | * Scores | Parameter | Value | | --- | --- | | Base score | 5.9 · Medium | | Exploitability score | - | | Impact score | - | **Vector:** CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N ## References * [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-9793) * [NVD](https://nvd.nist.gov/vuln/detail/CVE-2019-9793) * [Launchpad](https://launchpad.net/bugs/cve/CVE-2019-9793) * [Debian](https://security-tracker.debian.org/tracker/CVE-2019-9793) ### Related Ubuntu Security Notices (USN) + [USN-3927-1](https://usn.ubuntu.com/USN-3927-1) + Thunderbird vulnerabilities + 28 March 2019 + [USN-3918-2](https://usn.ubuntu.com/USN-3918-2) + Firefox vulnerabilities + 25 March 2019 + [USN-3918-1](https://usn.ubuntu.com/USN-3918-1) + Firefox vulnerabilities + 21 March 2019 ### Other references * * * *