#VU58609 Use-after-free in Mozilla Firefox - CVE-2021-4128
Published: December 7, 2021 / Updated: February 22, 2022
Vulnerability identifier: #VU58609
Vulnerability risk: High
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2021-4128
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
Mozilla Firefox
Mozilla Firefox
Software vendor:
Mozilla
Mozilla
Description
The vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to a use-after-free error when transitioning in and out of fullscreen mode. A remote attacker can trick the victim to visit a specially crafted website, trigger a use-after-free error and execute arbitrary code on the system.
Note, the vulnerability affects Firefox installations on macOS only.
Remediation
Install updates from vendor's website.