Buffer overflow in Mozilla Firefox - CVE-2021-29977
Published: July 13, 2021
Vulnerability identifier: #VU54685
CSH Severity: High
CVSS v4 BT: 6.1 [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-2021-29977
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 web page, 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-2021-29977
Install updates from vendor's website.
Mozilla Firefox - update to 90.0
firefox (Ubuntu package) - addressed in versions 90.0+build1-0ubuntu0.18.04.1, 90.0+build1-0ubuntu0.20.04.1, 90.0+build1-0ubuntu0.20.10.1, 90.0+build1-0ubuntu0.21.04.1
firefox (Ubuntu package) - addressed in versions 90.0+build1-0ubuntu0.18.04.1, 90.0+build1-0ubuntu0.20.04.1, 90.0+build1-0ubuntu0.20.10.1, 90.0+build1-0ubuntu0.21.04.1