Buffer overflow in Mozilla Firefox - CVE-2021-29966
Published: June 1, 2021
Vulnerability identifier: #VU53708
CSH Severity: High
CVSS v4: 8.6 [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]
CVE-ID: CVE-2021-29966
CWE-ID: CWE-119
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error when processing HTML content. A remote attacker can create a specially crafted webpage, trick the victim into opening it, trigger memory corruption and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Affected software
Mozilla Firefox
Arch Linux
Gentoo Linux
Ubuntu
firefox (Ubuntu package)
Arch Linux
Gentoo Linux
Ubuntu
firefox (Ubuntu package)
How to mitigate CVE-2021-29966
Install updates from vendor's website.
Mozilla Firefox - update to 89.0
firefox (Ubuntu package) - addressed in versions 89.0+build2-0ubuntu0.18.04.2, 89.0+build2-0ubuntu0.20.04.2, 89.0+build2-0ubuntu0.20.10.1, 89.0+build2-0ubuntu0.21.04.1
firefox (Ubuntu package) - addressed in versions 89.0+build2-0ubuntu0.18.04.2, 89.0+build2-0ubuntu0.20.04.2, 89.0+build2-0ubuntu0.20.10.1, 89.0+build2-0ubuntu0.21.04.1