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CVE-2021-4221

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.

Published Dec 22, 2022CWE-1007EPSS 0.41%

Overview

CVE-2021-4221 is a medium-severity vulnerability. It was published on December 22, 2022 and has a CVSS 3.1 base score of 4.3 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 4.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refbugzilla.mozilla.org/show_bug.cgi?id=1704422Refwww.mozilla.org/security/advisories/mfsa2021-38/Refbugzilla.mozilla.org/show_bug.cgi?id=1704422Refwww.mozilla.org/security/advisories/mfsa2021-38/

How CyberStrike helps

Frequently asked questions

What is CVE-2021-4221?

CVE-2021-4221 is a medium-severity vulnerability. It was published on December 22, 2022 and has a CVSS 3.1 base score of 4.3 (MEDIUM).

How severe is CVE-2021-4221?

This vulnerability has a CVSS 3.1 base score of 4.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-4221?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-4221?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-4221 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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