{"url":"http://public2.vulnerablecode.io/api/vulnerabilities/63215?format=json","vulnerability_id":"VCID-184j-aaaw-pbed","summary":"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. *This bug only affects Firefox for Android. Other operating systems are unaffected.**Note*: Due to a clerical error this advisory was not included in the original announcement, and was added in February 2022.","aliases":[{"alias":"CVE-2021-4221"}],"fixed_packages":[{"url":"http://public2.vulnerablecode.io/api/packages/582227?format=json","purl":"pkg:deb/debian/firefox@0?distro=sid","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/firefox@0%3Fdistro=sid"},{"url":"http://public2.vulnerablecode.io/api/packages/582059?format=json","purl":"pkg:deb/debian/firefox@149.0-1?distro=sid","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/firefox@149.0-1%3Fdistro=sid"},{"url":"http://public2.vulnerablecode.io/api/packages/1059611?format=json","purl":"pkg:deb/debian/firefox@149.0.2-1?distro=sid","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/firefox@149.0.2-1%3Fdistro=sid"},{"url":"http://public2.vulnerablecode.io/api/packages/1076056?format=json","purl":"pkg:deb/debian/firefox@150.0-1?distro=sid","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/firefox@150.0-1%3Fdistro=sid"},{"url":"http://public2.vulnerablecode.io/api/packages/1088670?format=json","purl":"pkg:deb/debian/firefox@150.0.1-1?distro=sid","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/firefox@150.0.1-1%3Fdistro=sid"}],"affected_packages":[],"references":[{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2021-4221","reference_id":"","reference_type":"","scores":[{"value":"0.00182","scoring_system":"epss","scoring_elements":"0.39623","published_at":"2026-04-29T12:55:00Z"},{"value":"0.00182","scoring_system":"epss","scoring_elements":"0.3984","published_at":"2026-04-01T12:55:00Z"},{"value":"0.00182","scoring_system":"epss","scoring_elements":"0.39986","published_at":"2026-04-02T12:55:00Z"},{"value":"0.00182","scoring_system":"epss","scoring_elements":"0.40006","published_at":"2026-04-16T12:55:00Z"},{"value":"0.00182","scoring_system":"epss","scoring_elements":"0.39977","published_at":"2026-04-18T12:55:00Z"},{"value":"0.00182","scoring_system":"epss","scoring_elements":"0.39897","published_at":"2026-04-21T12:55:00Z"},{"value":"0.00182","scoring_system":"epss","scoring_elements":"0.39724","published_at":"2026-04-24T12:55:00Z"},{"value":"0.00182","scoring_system":"epss","scoring_elements":"0.39709","published_at":"2026-04-26T12:55:00Z"},{"value":"0.00182","scoring_system":"epss","scoring_elements":"0.40014","published_at":"2026-04-04T12:55:00Z"},{"value":"0.00182","scoring_system":"epss","scoring_elements":"0.39934","published_at":"2026-04-07T12:55:00Z"},{"value":"0.00182","scoring_system":"epss","scoring_elements":"0.39988","published_at":"2026-04-08T12:55:00Z"},{"value":"0.00182","scoring_system":"epss","scoring_elements":"0.40001","published_at":"2026-04-09T12:55:00Z"},{"value":"0.00182","scoring_system":"epss","scoring_elements":"0.40011","published_at":"2026-04-11T12:55:00Z"},{"value":"0.00182","scoring_system":"epss","scoring_elements":"0.39975","published_at":"2026-04-12T12:55:00Z"},{"value":"0.00182","scoring_system":"epss","scoring_elements":"0.39956","published_at":"2026-04-13T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2021-4221"},{"reference_url":"https://www.mozilla.org/en-US/security/advisories/mfsa2021-38","reference_id":"mfsa2021-38","reference_type":"","scores":[{"value":"high","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://www.mozilla.org/en-US/security/advisories/mfsa2021-38"},{"reference_url":"https://www.mozilla.org/security/advisories/mfsa2021-38/","reference_id":"mfsa2021-38","reference_type":"","scores":[{"value":"4.3","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N"},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:P/A:N/T:P/P:M/B:A/M:M/D:T/2025-04-16T15:48:58Z/"}],"url":"https://www.mozilla.org/security/advisories/mfsa2021-38/"},{"reference_url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1704422","reference_id":"show_bug.cgi?id=1704422","reference_type":"","scores":[{"value":"4.3","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N"},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:P/A:N/T:P/P:M/B:A/M:M/D:T/2025-04-16T15:48:58Z/"}],"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1704422"}],"weaknesses":[],"exploits":[],"severity_range_score":"4.3 - 8.9","exploitability":null,"weighted_severity":null,"risk_score":null,"resource_url":"http://public2.vulnerablecode.io/vulnerabilities/VCID-184j-aaaw-pbed"}