CVE-2021-4221

Severity Score

4.3

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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.

Si un nombre de dominio contuviera un carácter RTL, el dominio se representaría a la derecha de la ruta. Esto podría generar confusión en el usuario y ataques de suplantación de identidad. <br>*Este error sólo afecta a Firefox para Android. Otros sistemas operativos no se ven afectados.*<br>*Nota*: Debido a un error administrativo, este aviso no se incluyó en el anuncio original y se agregó en febrero de 2022. Esta vulnerabilidad afecta a Firefox < 92.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

None

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

Partial

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2022-02-18 CVE Reserved
2022-12-22 CVE Published
2024-08-03 CVE Updated
2024-08-03 First Exploit
2025-03-30 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CAPEC

References (2)

URL	Tag	Source

URL	Date	SRC
https://bugzilla.mozilla.org/show_bug.cgi?id=1704422	2024-08-03

URL	Date	SRC

URL	Date	SRC
https://www.mozilla.org/security/advisories/mfsa2021-38	2022-12-24

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Mozilla Search vendor "Mozilla"	Firefox Search vendor "Mozilla" for product "Firefox"	< 92.0 Search vendor "Mozilla" for product "Firefox" and version " < 92.0"	-	Affected	in	Google Search vendor "Google"	Android Search vendor "Google" for product "Android"	-	-	Safe