Buffer overflow in Mozilla Firefox - CVE-2021-29947
Published: April 19, 2021
Vulnerability identifier: #VU52345
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-2021-29947
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 web 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
Ubuntu
firefox (Ubuntu package)
Arch Linux
Ubuntu
firefox (Ubuntu package)
How to mitigate CVE-2021-29947
Install updates from vendor's website.
Mozilla Firefox - update to 88.0
firefox (Ubuntu package) - addressed in versions 88.0+build2-0ubuntu0.16.04.1, 88.0+build2-0ubuntu0.18.04.2, 88.0+build2-0ubuntu0.20.04.1, 88.0+build2-0ubuntu0.20.10.1, 88.0+build2-0ubuntu0.21.04.1
firefox (Ubuntu package) - addressed in versions 88.0+build2-0ubuntu0.16.04.1, 88.0+build2-0ubuntu0.18.04.2, 88.0+build2-0ubuntu0.20.04.1, 88.0+build2-0ubuntu0.20.10.1, 88.0+build2-0ubuntu0.21.04.1