CVE-2021-4221 — Insufficient Visual Distinction of Homoglyphs Presented to User in Mozilla Firefox

CWE-1007 — Insufficient Visual Distinction of Homoglyphs Presented to User4 documents4 sources
Severity
4.3MEDIUMNVD
EPSS
0.2%
top 60.08%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
Mozilla FirefoxDebian Firefox
Timeline
PublishedDec 22

Description

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. *This bug only affects Firefox for Android. Other operating systems are unaffected.**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.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:NExploitability: 2.8 | Impact: 1.4

Affected Packages4 packages

▶CVEListV5mozilla/firefoxunspecified — 92
▶NVDmozilla/firefox< 92.0
▶mozillamozilla/firefox

🔴Vulnerability Details

1
GHSA
GHSA-wmph-fgw4-55rj: If a domain name contained a RTL character, it would cause the domain to be rendered to the right of the path↗2022-12-22
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📋Vendor Advisories

2
Debian
CVE-2021-4221: firefox - If a domain name contained a RTL character, it would cause the domain to be rend...↗2021
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Mozilla
Mozilla Foundation Security Advisory 2021-38: CVE-2021-4221↗
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