Home/CVE/If a domain name contained a RTL character, it would cause the domain to be rendered to the right of the path. This coul
CVE

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 coul

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.

MEDIUM · CVSS 4.3 EPSS 0.00182
Schedule remediation
  • Public exploit or PoC is available
Sigma rules1 YARA rules0
⬡

Weakness Classification

CWE-1007Insufficient Visual Distinction of Homoglyphs Presented to User
▤

Affected Products & Versions

1
mozilla firefox< 92.0
⚠

Public Exploits & PoCs

1
pocbugzilla.mozilla.org · show_bug.cgi?id=1704422bugzilla.mozilla.org
◈

Sigma Hunt Rules

1
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
producthighSQLite Firefox Profile Data DB Access
▣

Scoring & Timeline

4.3
MEDIUM · CVSS v3.1 · security@mozilla.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD22 Dec 2022 · 08:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
SSVC triage · cisa-vulnrichment
Exploitation
poc
Automatable
no
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

1
mozilla-mfsaMFSA2021-38
🔗

References & Sources

1
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://www.mozilla.org/security/advisories/mfsa2021-38/Vendor Advisory
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