Buffer overflow in Mozilla Firefox - CVE-2020-12396
Published: May 5, 2020
Vulnerability identifier: #VU27539
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-2020-12396
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 website, trick the victim into visiting 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
firefox (Ubuntu package)
firefox (Alpine package)
Arch Linux
Gentoo Linux
firefox (Ubuntu package)
firefox (Alpine package)
How to mitigate CVE-2020-12396
Install updates from vendor's website.
Mozilla Firefox - update to 76.0
firefox (Ubuntu package) - addressed in versions 76.0+build2-0ubuntu0.16.04.1, 76.0+build2-0ubuntu0.18.04.1, 76.0+build2-0ubuntu0.19.10.1, 76.0+build2-0ubuntu0.20.04.1, 76.0.1+build1-0ubuntu0.16.04.1, 76.0.1+build1-0ubuntu0.18.04.1, 76.0.1+build1-0ubuntu0.19.10.1, 76.0.1+build1-0ubuntu0.20.04.1
firefox (Alpine package) - update to 76.0-r0
firefox (Ubuntu package) - addressed in versions 76.0+build2-0ubuntu0.16.04.1, 76.0+build2-0ubuntu0.18.04.1, 76.0+build2-0ubuntu0.19.10.1, 76.0+build2-0ubuntu0.20.04.1, 76.0.1+build1-0ubuntu0.16.04.1, 76.0.1+build1-0ubuntu0.18.04.1, 76.0.1+build1-0ubuntu0.19.10.1, 76.0.1+build1-0ubuntu0.20.04.1
firefox (Alpine package) - update to 76.0-r0