VULNERABILITY INTELLIGENCE

CVE-2021-4221

CVSS score4.3 MEDIUM

EPSS probability0.43%

CISA KEVNot currently listed

Published2022-12-22

Last modified2026-06-17

CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

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. <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.

Weakness classification

nvd@nist.gov: NVD-CWE-Other
134c704f-9b21-4f2e-91b3-4a467353bcc0: CWE-1007

Primary references

security@mozilla.org — Exploit, Issue Tracking, Vendor Advisory
security@mozilla.org — Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108 — Exploit, Issue Tracking, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108 — Vendor Advisory