--- title: "CVE-2019-9820\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-2019-9820?format=md keywords: index, follow --- # CVE-2019-9820 Publication date 21 May 2019 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-2019-9820?format=md#impact-score) Toggle side navigation ## Description A use-after-free vulnerability can occur in the chrome event handler when it is freed while still in use. This results in a potentially exploitable crash. This vulnerability affects Thunderbird < 60.7, Firefox < 67, and Firefox ESR < 60.7. [Read the notes from the security team](https://ubuntu.com/security/CVE-2019-9820?format=md#notes) ## Status Show unmaintained releases | Package | Ubuntu Release | Status | | --- | --- | --- | | firefox | 24.04 LTS noble | Fixed 67.0+build2-0ubuntu1 | | 23.10 mantic | Fixed 67.0+build2-0ubuntu1 | | 23.04 lunar | Fixed 67.0+build2-0ubuntu1 | | 22.10 kinetic | Fixed 67.0+build2-0ubuntu1 | | 22.04 LTS jammy | Fixed 67.0+build2-0ubuntu1 | | 21.10 impish | Fixed 67.0+build2-0ubuntu1 | | 21.04 hirsute | Fixed 67.0+build2-0ubuntu1 | | 20.10 groovy | Fixed 67.0+build2-0ubuntu1 | | 20.04 LTS focal | Fixed 67.0+build2-0ubuntu1 | | 19.10 eoan | Fixed 67.0+build2-0ubuntu1 | | 19.04 disco | Fixed 67.0+build2-0ubuntu0.19.04.1 | | 18.10 cosmic | Fixed 67.0+build2-0ubuntu0.18.10.1 | | 18.04 LTS bionic | Fixed 67.0+build2-0ubuntu0.18.04.1 | | 16.04 LTS xenial | Fixed 67.0+build2-0ubuntu0.16.04.1 | | 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 | | 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 1:60.7.0+build1-0ubuntu3 | | 23.10 mantic | Fixed 1:60.7.0+build1-0ubuntu3 | | 23.04 lunar | Fixed 1:60.7.0+build1-0ubuntu3 | | 22.10 kinetic | Fixed 1:60.7.0+build1-0ubuntu3 | | 22.04 LTS jammy | Fixed 1:60.7.0+build1-0ubuntu3 | | 21.10 impish | Fixed 1:60.7.0+build1-0ubuntu3 | | 21.04 hirsute | Fixed 1:60.7.0+build1-0ubuntu3 | | 20.10 groovy | Fixed 1:60.7.0+build1-0ubuntu3 | | 20.04 LTS focal | Fixed 1:60.7.0+build1-0ubuntu3 | | 19.10 eoan | Fixed 1:60.7.0+build1-0ubuntu3 | | 19.04 disco | Fixed 1:60.7.0+build1-0ubuntu0.19.04.1 | | 18.10 cosmic | Fixed 1:60.7.0+build1-0ubuntu0.18.10.1 | | 18.04 LTS bionic | Fixed 1:60.7.0+build1-0ubuntu0.18.04.1 | | 16.04 LTS xenial | Fixed 1:60.7.0+build1-0ubuntu0.16.04.1 | | 14.04 LTS trusty | Not in release | --- * [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-2019-9820) * [NVD](https://nvd.nist.gov/vuln/detail/CVE-2019-9820) * [Launchpad](https://launchpad.net/bugs/cve/CVE-2019-9820) * [Debian](https://security-tracker.debian.org/tracker/CVE-2019-9820) ### Related Ubuntu Security Notices (USN) + [USN-3997-1](https://usn.ubuntu.com/USN-3997-1) + Thunderbird vulnerabilities + 28 May 2019 + [USN-3991-1](https://usn.ubuntu.com/USN-3991-1) + Firefox vulnerabilities + 21 May 2019 ### Other references * * *