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CVE-2021-38506

Published: 3 November 2021

Through a series of navigations, Firefox could have entered fullscreen mode without notification or warning to the user. This could lead to spoofing attacks on the browser UI including phishing. This vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3.

Notes

AuthorNote
tyhicks
mozjs contains a copy of the SpiderMonkey JavaScript engine

Priority

Medium

Cvss 3 Severity Score

4.3

Score breakdown

Status

Package Release Status
firefox
Launchpad, Ubuntu, Debian
focal
Released (94.0+build3-0ubuntu0.20.04.1)
hirsute
Released (94.0+build3-0ubuntu0.21.04.1)
impish
Released (94.0+build3-0ubuntu0.21.10.1)
kinetic
Released (94.0+build3-0ubuntu1)
lunar
Released (94.0+build3-0ubuntu1)
trusty Does not exist

xenial Ignored
(end of standard support, was needed)
bionic
Released (94.0+build3-0ubuntu0.18.04.1)
upstream
Released (94)
jammy
Released (94.0+build3-0ubuntu1)
mantic
Released (94.0+build3-0ubuntu1)
mozjs38
Launchpad, Ubuntu, Debian
bionic Needs triage

focal Does not exist

hirsute Does not exist

impish Does not exist

jammy Does not exist

kinetic Does not exist

lunar Does not exist

trusty Does not exist

upstream Needs triage

xenial Does not exist

mantic Does not exist

mozjs52
Launchpad, Ubuntu, Debian
bionic Needs triage

focal Needs triage

hirsute Does not exist

impish Does not exist

jammy Does not exist

kinetic Does not exist

lunar Does not exist

trusty Does not exist

upstream Needs triage

xenial Does not exist

mantic Does not exist

mozjs68
Launchpad, Ubuntu, Debian
bionic Does not exist

focal Needs triage

hirsute Does not exist

impish Does not exist

jammy Does not exist

kinetic Does not exist

lunar Does not exist

trusty Does not exist

upstream Needs triage

xenial Does not exist

mantic Does not exist

mozjs78
Launchpad, Ubuntu, Debian
bionic Does not exist

jammy Needs triage

trusty Does not exist

xenial Does not exist

focal Does not exist

hirsute Ignored
(end of life)
impish Ignored
(end of life)
upstream Needs triage

kinetic Ignored
(end of life, was needs-triage)
mantic Does not exist

lunar Ignored
(end of life, was needs-triage)
thunderbird
Launchpad, Ubuntu, Debian
bionic
Released (1:91.5.0+build1-0ubuntu0.18.04.1)
focal
Released (1:91.5.0+build1-0ubuntu0.20.04.1)
hirsute Ignored
(end of life)
impish
Released (1:91.3.1+build1-0ubuntu0.21.10.1)
jammy
Released (1:91.3.1+build1-0ubuntu1)
kinetic
Released (1:91.3.1+build1-0ubuntu1)
lunar
Released (1:91.3.1+build1-0ubuntu1)
trusty Does not exist

upstream
Released (91.3)
xenial Ignored
(end of standard support, was needed)
mantic
Released (1:91.3.1+build1-0ubuntu1)

Severity score breakdown

Parameter Value
Base score 4.3
Attack vector Network
Attack complexity Low
Privileges required None
User interaction Required
Scope Unchanged
Confidentiality None
Integrity impact Low
Availability impact None
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N