CVE-2021-23995

Published: 19 April 2021

When Responsive Design Mode was enabled, it used references to objects that were previously freed. We presume that with enough effort this could have been exploited to run arbitrary code. This vulnerability affects Firefox ESR < 78.10, Thunderbird < 78.10, and Firefox < 88.

Notes

Author	Note
tyhicks	mozjs contains a copy of the SpiderMonkey JavaScript engine

Priority

Cvss 3 Severity Score

8.8

Score breakdown

Status

Package	Release	Status
firefox Launchpad, Ubuntu, Debian	bionic	Released (88.0+build2-0ubuntu0.18.04.2)
	focal	Released (88.0+build2-0ubuntu0.20.04.1)
	groovy	Released (88.0+build2-0ubuntu0.20.10.1)
	hirsute	Released (88.0+build2-0ubuntu0.21.04.1)
	impish	Released (88.0.1+build1-0ubuntu2)
	jammy	Released (88.0.1+build1-0ubuntu2)
	kinetic	Released (88.0.1+build1-0ubuntu2)
	lunar	Released (88.0.1+build1-0ubuntu2)
	mantic	Released (88.0.1+build1-0ubuntu2)
	noble	Released (88.0.1+build1-0ubuntu2)
	trusty	Does not exist
	upstream	Released (88)
	xenial	Released (88.0+build2-0ubuntu0.16.04.1)
firefox-esr Launchpad, Ubuntu, Debian	bionic	Does not exist
	focal	Does not exist
	groovy	Does not exist
	hirsute	Does not exist
	impish	Does not exist
	jammy	Does not exist
	kinetic	Does not exist
	lunar	Does not exist
	mantic	Does not exist
	noble	Does not exist
	trusty	Does not exist
	upstream	Needs triage
	xenial	Does not exist
mozjs38 Launchpad, Ubuntu, Debian	bionic	Ignored
	focal	Does not exist
	groovy	Does not exist
	hirsute	Does not exist
	impish	Does not exist
	jammy	Does not exist
	kinetic	Does not exist
	lunar	Does not exist
	mantic	Does not exist
	noble	Does not exist
	trusty	Does not exist
	upstream	Ignored
	xenial	Does not exist
mozjs52 Launchpad, Ubuntu, Debian	bionic	Ignored
	focal	Ignored
	groovy	Ignored (end of life)
	hirsute	Does not exist
	impish	Does not exist
	jammy	Does not exist
	kinetic	Does not exist
	lunar	Does not exist
	mantic	Does not exist
	noble	Does not exist
	trusty	Does not exist
	upstream	Ignored
	xenial	Does not exist
mozjs68 Launchpad, Ubuntu, Debian	bionic	Does not exist
	focal	Ignored
	groovy	Ignored (end of life)
	hirsute	Does not exist
	impish	Does not exist
	jammy	Does not exist
	kinetic	Does not exist
	lunar	Does not exist
	mantic	Does not exist
	noble	Does not exist
	trusty	Does not exist
	upstream	Ignored
	xenial	Does not exist
mozjs78 Launchpad, Ubuntu, Debian	bionic	Does not exist
	focal	Does not exist
	groovy	Ignored (end of life)
	hirsute	Ignored (end of life)
	impish	Ignored (end of life)
	jammy	Ignored
	kinetic	Ignored (end of life, was needs-triage)
	lunar	Ignored (end of life, was needs-triage)
	mantic	Does not exist
	noble	Does not exist
	trusty	Does not exist
	upstream	Ignored
	xenial	Does not exist
thunderbird Launchpad, Ubuntu, Debian	bionic	Released (1:78.11.0+build1-0ubuntu0.18.04.2)
	focal	Released (1:78.11.0+build1-0ubuntu0.20.04.2)
	groovy	Released (1:78.11.0+build1-0ubuntu0.20.10.2)
	hirsute	Released (1:78.11.0+build1-0ubuntu0.21.04.2)
	impish	Released (1:78.11.0+build1-0ubuntu2)
	jammy	Released (1:78.11.0+build1-0ubuntu2)
	kinetic	Released (1:78.11.0+build1-0ubuntu2)
	lunar	Released (1:78.11.0+build1-0ubuntu2)
	mantic	Released (1:78.11.0+build1-0ubuntu2)
	noble	Released (1:78.11.0+build1-0ubuntu2)
	trusty	Does not exist
	upstream	Released (78.10)
	xenial	Ignored (end of standard support, was needed)

Severity score breakdown

Parameter	Value
Base score	8.8
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	Required
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References

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