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CVE-2021-4221

Published: 22 December 2022

If a domain name contained a RTL character, it would cause the domain to be rendered to the right of the path. This could lead to user confusion and spoofing attacks. <br>*This bug only affects Firefox for Android. Other operating systems are unaffected.*<br>*Note*: Due to a clerical error this advisory was not included in the original announcement, and was added in Feburary 2022. This vulnerability affects Firefox < 92.

Notes

AuthorNote
mdeslaur
starting with Ubuntu 22.04, the firefox package is just a script
that installs the Firefox snap
alexmurray
Only affects Firefox for Android

Priority

Medium

Cvss 3 Severity Score

4.3

Score breakdown

Status

Package Release Status
firefox
Launchpad, Ubuntu, Debian
kinetic Not vulnerable
(Firefox for Android only)
bionic Not vulnerable
(Firefox for Android only)
focal Not vulnerable
(Firefox for Android only)
jammy Not vulnerable
(Firefox for Android only)
trusty Ignored
(end of standard support)
upstream Not vulnerable
(Firefox for Android only)
xenial Ignored
(end of standard support)

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