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CVE-2021-38493

Published: 8 September 2021

Mozilla developers reported memory safety bugs present in Firefox 91 and Firefox ESR 78.13. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox ESR < 78.14, Thunderbird < 78.14, and Firefox < 92.

Notes

AuthorNote
tyhicks
mozjs contains a copy of the SpiderMonkey JavaScript engine

Priority

Medium

Cvss 3 Severity Score

8.8

Score breakdown

Status

Package Release Status
firefox
Launchpad, Ubuntu, Debian
jammy
Released (92.0+build3-0ubuntu1)
kinetic
Released (92.0+build3-0ubuntu1)
impish
Released (92.0+build3-0ubuntu1)
trusty Does not exist

xenial Ignored
(end of standard support, was needed)
upstream
Released (92)
bionic
Released (92.0+build3-0ubuntu0.18.04.1)
focal
Released (92.0+build3-0ubuntu0.20.04.1)
hirsute
Released (92.0+build3-0ubuntu0.21.04.1)
lunar
Released (92.0+build3-0ubuntu1)
firefox-esr
Launchpad, Ubuntu, Debian
jammy Does not exist

kinetic Does not exist

impish Does not exist

trusty Does not exist

xenial Ignored
(end of standard support)
bionic Does not exist

focal Does not exist

hirsute Does not exist

upstream
Released (78.14.0esr-1)
lunar Does not exist

mozjs38
Launchpad, Ubuntu, Debian
jammy Does not exist

kinetic Does not exist

impish Does not exist

trusty Does not exist

xenial Does not exist

bionic Needs triage

focal Does not exist

hirsute Does not exist

upstream Needs triage

lunar Does not exist

mozjs52
Launchpad, Ubuntu, Debian
jammy Does not exist

kinetic Does not exist

impish Does not exist

trusty Does not exist

xenial Does not exist

bionic Needs triage

focal Needs triage

hirsute Does not exist

upstream Needs triage

lunar Does not exist

mozjs68
Launchpad, Ubuntu, Debian
jammy Does not exist

kinetic Does not exist

impish Does not exist

trusty Does not exist

xenial Does not exist

bionic Does not exist

focal Needs triage

hirsute Does not exist

upstream Needs triage

lunar Does not exist

mozjs78
Launchpad, Ubuntu, Debian
jammy Needs triage

trusty Does not exist

xenial Does not exist

bionic Does not exist

focal Does not exist

upstream Needs triage

hirsute Ignored
(end of life)
kinetic Ignored
(end of life, was needs-triage)
impish Ignored
(end of life)
lunar Needs triage

thunderbird
Launchpad, Ubuntu, Debian
jammy Not vulnerable
(1:91.1.2+build1-0ubuntu1)
kinetic Not vulnerable
(1:91.1.2+build1-0ubuntu1)
impish Not vulnerable
(1:91.1.2+build1-0ubuntu1)
bionic
Released (1:78.14.0+build1-0ubuntu0.18.04.1)
trusty Does not exist

xenial Ignored
(end of standard support, was needed)
upstream
Released (78.14)
focal
Released (1:78.14.0+build1-0ubuntu0.20.04.1)
hirsute
Released (1:78.14.0+build1-0ubuntu0.21.04.1)
lunar Not vulnerable
(1:91.1.2+build1-0ubuntu1)

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