Vulnerability Details : CVE-2021-4221
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.
Products affected by CVE-2021-4221
- cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-4221
0.09%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 37 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-4221
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
4.3
|
MEDIUM | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N |
2.8
|
1.4
|
NIST |
References for CVE-2021-4221
-
https://bugzilla.mozilla.org/show_bug.cgi?id=1704422
1704422 - (CVE-2021-4221) Address Bar Spoofing due to Arabic RTL charactersExploit;Issue Tracking;Vendor Advisory
-
https://www.mozilla.org/security/advisories/mfsa2021-38/
Security Vulnerabilities fixed in Firefox 92 — MozillaVendor Advisory
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