--- title: "CVE-2023-4583\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-2023-4583?format=md keywords: index, follow --- # CVE-2023-4583 Publication date 30 August 2023 Last updated 26 August 2025 --- Ubuntu priority **Medium** [Why this priority?](https://ubuntu.com/security/cves/about#priority ) ## Cvss 3 Severity Score **7.5 · High** [Score breakdown](https://ubuntu.com/security/CVE-2023-4583?format=md#impact-score) Toggle side navigation ## Description When checking if the Browsing Context had been discarded in `HttpBaseChannel`, if the load group was not available then it was assumed to have already been discarded which was not always the case for private channels after the private session had ended. This vulnerability affects Firefox < 117, Firefox ESR < 115.2, and Thunderbird < 115.2. [Read the notes from the security team](https://ubuntu.com/security/CVE-2023-4583?format=md#notes) ## Status Show unmaintained releases | Package | Ubuntu Release | Status | | --- | --- | --- | | firefox | 24.04 LTS noble | Not affected | | 23.10 mantic | Not affected | | 23.04 lunar | Ignored end of life, was needs-triage | | 22.04 LTS jammy | Not affected | | 20.04 LTS focal | Fixed 117.0+build2-0ubuntu0.20.04.1 | | 18.04 LTS bionic | Ignored end of standard support | | 16.04 LTS xenial | Ignored end of standard support | | 14.04 LTS trusty | Ignored end of standard support | | mozjs102 | 24.04 LTS noble | Ignored | | 23.10 mantic | Ignored end of life, was needs-triage | | 23.04 lunar | Ignored end of life, was needs-triage | | 22.04 LTS jammy | Ignored | | 20.04 LTS focal | 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 | | 22.04 LTS jammy | Not in release | | 20.04 LTS focal | 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 | | 22.04 LTS jammy | Not in release | | 20.04 LTS focal | Ignored | | 18.04 LTS bionic | Ignored | | 16.04 LTS xenial | Not in release | | 14.04 LTS trusty | Not in release | | mozjs68 | 24.04 LTS noble | Not in release | | 23.10 mantic | Not in release | | 23.04 lunar | Not in release | | 22.04 LTS jammy | Not in release | | 20.04 LTS focal | Ignored | | 18.04 LTS bionic | Not in release | | 16.04 LTS xenial | Not in release | | 14.04 LTS trusty | Not in release | | mozjs78 | 24.04 LTS noble | Not in release | | 23.10 mantic | Not in release | | 23.04 lunar | Ignored end of life, was needs-triage | | 22.04 LTS jammy | Ignored | | 20.04 LTS focal | Not in release | | 18.04 LTS bionic | Not in release | | 16.04 LTS xenial | Not in release | | 14.04 LTS trusty | Not in release | | mozjs91 | 24.04 LTS noble | Not in release | | 23.10 mantic | Not in release | | 23.04 lunar | Not in release | | 22.04 LTS jammy | Ignored | | 20.04 LTS focal | Not in release | | 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 1:115.2.0+build1-0ubuntu1 | | 23.10 mantic | Fixed 1:115.2.0+build1-0ubuntu1 | | 23.04 lunar | Fixed 1:115.3.1+build1-0ubuntu0.23.04.1 | | 22.04 LTS jammy | Fixed 1:115.3.1+build1-0ubuntu0.22.04.2 | | 20.04 LTS focal | Fixed 1:115.3.1+build1-0ubuntu0.20.04.1 | | 18.04 LTS bionic | Ignored end of standard support | | 16.04 LTS xenial | Ignored end of standard support | | 14.04 LTS trusty | Ignored end of standard support | --- * [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 --- ### [mdeslaur](https://launchpad.net/~mdeslaur) starting with Ubuntu 22.04, the firefox package is just a script that installs the Firefox snap ## Severity score breakdown CVSS version: CVSS v3.0 **Base score** 7.5 · High * Base metrics | Parameter | Value | | --- | --- | | Attack vector | Network | | Attack complexity | Low | | Privileges required | None | | User interaction | None | | Scope | Unchanged | | Confidentiality impact | None | | Integrity impact | High | | Availability impact | None | * Scores | Parameter | Value | | --- | --- | | Base score | 7.5 · High | | Exploitability score | - | | Impact score | - | **Vector:** CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N ## References * [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-4583) * [NVD](https://nvd.nist.gov/vuln/detail/CVE-2023-4583) * [Launchpad](https://launchpad.net/bugs/cve/CVE-2023-4583) * [Debian](https://security-tracker.debian.org/tracker/CVE-2023-4583) ### Related Ubuntu Security Notices (USN) + [USN-6320-1](https://usn.ubuntu.com/USN-6320-1) + Firefox vulnerabilities + 30 August 2023 + [USN-6405-1](https://usn.ubuntu.com/USN-6405-1) + Thunderbird vulnerabilities + 3 October 2023 ### Other references *