CVE-2021-4221 — MEDIUM (4.3)

Vulnerability 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.

CVSS Score

4.3

MEDIUM

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality

NONE

Integrity

LOW

Availability

NONE

Affected Products

Vendor	Product	Versions
Mozilla	Firefox	< 92.0
Google	Android	-

Related Weaknesses (CWE)

CWE-1007

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1704422ExploitIssue TrackingVendor Advisory
https://www.mozilla.org/security/advisories/mfsa2021-38/Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1704422ExploitIssue TrackingVendor Advisory
https://www.mozilla.org/security/advisories/mfsa2021-38/Vendor Advisory

FAQ

What is CVE-2021-4221?

CVE-2021-4221 is a vulnerability with a CVSS score of 4.3 (MEDIUM). 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 Firefo...

How severe is CVE-2021-4221?

CVE-2021-4221 has been rated MEDIUM with a CVSS base score of 4.3/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2021-4221?

Check the references section above for vendor advisories and patch information. Affected products include: Mozilla Firefox, Google Android.