CVE-2023-3600 Use-after-free in workers

Q: Is CVE-2023-3600 being exploited?

There is no known exploitation of CVE-2023-3600 in the wild and no public exploit code.

High 8.8 Published 12 Jul 2023 Updated 18 Dec 2025

A use-after-free flaw in Firefox workers allows attackers to cause a crash or potentially execute arbitrary code.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: Available

What is CVE-2023-3600?

CVE-2023-3600 is a high-severity use after free vulnerability in Mozilla Firefox, published on 12 Jul 2023. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

During the worker lifecycle, a use-after-free condition could have occurred, which could have led to a potentially exploitable crash. This vulnerability affects Firefox < 115.0.2, Firefox ESR < 115.0.2, and Thunderbird < 115.0.1.

Weakness: CWE-416

Which versions are affected by CVE-2023-3600?

It affects 3 products.

Linux distribution packages (27)

`MozillaFirefox` SUSE:Enterprise Storage 7	All versions	`115.0.2-150200.152.96.1`
`MozillaFirefox` SUSE:Enterprise Storage 7.1	All versions	`115.0.2-150200.152.96.1`
`MozillaFirefox` SUSE:Linux Enterprise High Performance Computing 15 SP1-LTSS	All versions	`115.0.2-150000.150.94.1`
`MozillaFirefox` SUSE:Linux Enterprise High Performance Computing 15 SP2-LTSS	All versions	`115.0.2-150200.152.96.1`
`MozillaFirefox` SUSE:Linux Enterprise High Performance Computing 15 SP3-ESPOS	All versions	`115.0.2-150200.152.96.1`
`MozillaFirefox` SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSS	All versions	`115.0.2-150200.152.96.1`
`MozillaFirefox` SUSE:Linux Enterprise Module for Desktop Applications 15 SP4	All versions	`115.0.2-150200.152.96.1`
`MozillaFirefox` SUSE:Linux Enterprise Module for Desktop Applications 15 SP5	All versions	`115.0.2-150200.152.96.1`
`MozillaFirefox` SUSE:Linux Enterprise Real Time 15 SP3	All versions	`115.0.2-150200.152.96.1`
`MozillaFirefox` SUSE:Linux Enterprise Server 12 SP2-BCL	All versions	`115.0.2-112.170.2`
`MozillaFirefox` SUSE:Linux Enterprise Server 12 SP4-ESPOS	All versions	`115.0.2-112.170.2`
`MozillaFirefox` SUSE:Linux Enterprise Server 12 SP4-LTSS	All versions	`115.0.2-112.170.2`
`MozillaFirefox` SUSE:Linux Enterprise Server 12 SP5	All versions	`115.0.2-112.170.2`
`MozillaFirefox` SUSE:Linux Enterprise Server 15 SP1-LTSS	All versions	`115.0.2-150000.150.94.1`
`MozillaFirefox` SUSE:Linux Enterprise Server 15 SP2-LTSS	All versions	`115.0.2-150200.152.96.1`
`MozillaFirefox` SUSE:Linux Enterprise Server 15 SP3-LTSS	All versions	`115.0.2-150200.152.96.1`
`MozillaFirefox` SUSE:Linux Enterprise Server for SAP Applications 12 SP4	All versions	`115.0.2-112.170.2`
`MozillaFirefox` SUSE:Linux Enterprise Server for SAP Applications 12 SP5	All versions	`115.0.2-112.170.2`
`MozillaFirefox` SUSE:Linux Enterprise Server for SAP Applications 15 SP1	All versions	`115.0.2-150000.150.94.1`
`MozillaFirefox` SUSE:Linux Enterprise Server for SAP Applications 15 SP2	All versions	`115.0.2-150200.152.96.1`
`MozillaFirefox` SUSE:Linux Enterprise Server for SAP Applications 15 SP3	All versions	`115.0.2-150200.152.96.1`
`MozillaFirefox` SUSE:Linux Enterprise Software Development Kit 12 SP5	All versions	`115.0.2-112.170.2`
`MozillaFirefox` SUSE:OpenStack Cloud 9	All versions	`115.0.2-112.170.2`
`MozillaFirefox` SUSE:OpenStack Cloud Crowbar 9	All versions	`115.0.2-112.170.2`
`MozillaFirefox` openSUSE:Leap 15.4	All versions	`115.0.2-150200.152.96.1`
`MozillaFirefox` openSUSE:Leap 15.5	All versions	`115.0.2-150200.152.96.1`
`MozillaFirefox` openSUSE:Tumbleweed	All versions	`115.0.2-1.1`

Products include Mozilla Firefox, Mozilla Firefox Esr, Mozilla Thunderbird.

How do I fix CVE-2023-3600?

Upgrade to a fixed version.

Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.

Is CVE-2023-3600 being exploited?

There is no known exploitation of CVE-2023-3600 in the wild and no public exploit code.

All Mozilla Firefox vulnerabilities

Sources

Also known as GHSA-f7m4-v8xh-mj88, SUSE-SU-2023:2958-1, SUSE-SU-2023:2959-1, SUSE-SU-2023:2960-1, UBUNTU-CVE-2023-3600, USN-6218-1 and 1 more.