cve/2021/CVE-2021-4221.md

### [CVE-2021-4221](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-4221)
![](https://img.shields.io/static/v1?label=Product&message=Firefox&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=%3C%2092%20&color=brighgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=Address%20bar%20spoofing%20on%20Firefox%20for%20Android%20due%20to%20RTL%20characters&color=brighgreen)

### 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.

### POC

#### Reference
- https://bugzilla.mozilla.org/show_bug.cgi?id=1704422

#### Github
No PoCs found on GitHub currently.