{"api_version":"1","generated_at":"2026-07-23T07:36:10+00:00","cve":"CVE-2018-5121","urls":{"html":"https://cve.report/CVE-2018-5121","api":"https://cve.report/api/cve/CVE-2018-5121.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2018-5121","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2018-5121"},"summary":{"title":"CVE-2018-5121","description":"Low descenders on some Tibetan characters in several fonts on OS X are clipped when rendered in the addressbar. When used as part of an Internationalized Domain Name (IDN) this can be used for domain name spoofing attacks. Note: This attack only affects OS X operating systems. Other operating systems are unaffected. This vulnerability affects Firefox < 58.","state":"PUBLIC","assigner":"security@mozilla.org","published_at":"2018-06-11 21:29:00","updated_at":"2018-06-25 17:24:00"},"problem_types":["CWE-20"],"metrics":[],"references":[{"url":"http://www.securityfocus.com/bid/102786","name":"102786","refsource":"BID","tags":["Third Party Advisory","VDB Entry"],"title":"Mozilla Firefox MFSA2018-02 Multiple Security Vulnerabilities","mime":"text/html","httpstatus":"200","archivestatus":"0"},{"url":"https://www.mozilla.org/security/advisories/mfsa2018-02/","name":"https://www.mozilla.org/security/advisories/mfsa2018-02/","refsource":"CONFIRM","tags":["Vendor Advisory"],"title":"Security vulnerabilities fixed in Firefox 58 — Mozilla","mime":"text/html","httpstatus":"-1","archivestatus":"200"},{"url":"http://www.securitytracker.com/id/1040270","name":"1040270","refsource":"SECTRACK","tags":["Third Party Advisory","VDB Entry"],"title":"Mozilla Firefox Multiple Bugs Let Remote Users Spoof URLs, Bypass Cross-Domain Security Restrictions, Obtain Potentially Sensitive Information, and Execute Arbitrary Code - SecurityTracker","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1402368","name":"https://bugzilla.mozilla.org/show_bug.cgi?id=1402368","refsource":"CONFIRM","tags":["Issue Tracking","Permissions Required"],"title":"Access Denied","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://www.cve.org/CVERecord?id=CVE-2018-5121","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2018-5121","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2018","cve_id":"5121","vulnerable":"-1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"apple","cpe5":"mac_os_x","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2018","cve_id":"5121","vulnerable":"0","versionEndIncluding":"1","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"apple","cpe5":"mac_os_x","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2018","cve_id":"5121","vulnerable":"1","versionEndIncluding":"57.0.4","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"mozilla","cpe5":"firefox","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"CVE_data_meta":{"ASSIGNER":"security@mozilla.org","ID":"CVE-2018-5121","STATE":"PUBLIC"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"Firefox","version":{"version_data":[{"version_affected":"<","version_value":"58"}]}}]},"vendor_name":"Mozilla"}]}},"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"Low descenders on some Tibetan characters in several fonts on OS X are clipped when rendered in the addressbar. When used as part of an Internationalized Domain Name (IDN) this can be used for domain name spoofing attacks. Note: This attack only affects OS X operating systems. Other operating systems are unaffected. This vulnerability affects Firefox < 58."}]},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"OS X Tibetan characters render incompletely in the addressbar"}]}]},"references":{"reference_data":[{"name":"1040270","refsource":"SECTRACK","url":"http://www.securitytracker.com/id/1040270"},{"name":"https://bugzilla.mozilla.org/show_bug.cgi?id=1402368","refsource":"CONFIRM","url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1402368"},{"name":"102786","refsource":"BID","url":"http://www.securityfocus.com/bid/102786"},{"name":"https://www.mozilla.org/security/advisories/mfsa2018-02/","refsource":"CONFIRM","url":"https://www.mozilla.org/security/advisories/mfsa2018-02/"}]}},"nvd":{"publishedDate":"2018-06-11 21:29:00","lastModifiedDate":"2018-06-25 17:24:00","problem_types":["CWE-20"],"metrics":{"baseMetricV3":{"cvssV3":{"version":"3.0","vectorString":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"LOW","availabilityImpact":"NONE","baseScore":5.3,"baseSeverity":"MEDIUM"},"exploitabilityScore":3.9,"impactScore":1.4},"baseMetricV2":{"cvssV2":{"version":"2.0","vectorString":"AV:N/AC:L/Au:N/C:N/I:P/A:N","accessVector":"NETWORK","accessComplexity":"LOW","authentication":"NONE","confidentialityImpact":"NONE","integrityImpact":"PARTIAL","availabilityImpact":"NONE","baseScore":5},"severity":"MEDIUM","exploitabilityScore":10,"impactScore":2.9,"obtainAllPrivilege":false,"obtainUserPrivilege":false,"obtainOtherPrivilege":false,"userInteractionRequired":false}},"configurations":{"CVE_data_version":"4.0","nodes":[{"operator":"AND","children":[{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*","versionEndIncluding":"57.0.4","cpe_name":[]}]},{"operator":"OR","children":[],"cpe_match":[{"vulnerable":false,"cpe23Uri":"cpe:2.3:o:apple:mac_os_x:*:*:*:*:*:*:*:*","cpe_name":[]}]}],"cpe_match":[]}]}},"legacy_mitre":{"record":{"CveYear":"2018","CveId":"5121","Ordinal":"121075","Title":"CVE-2018-5121","CVE":"CVE-2018-5121","Year":"2018"},"notes":[{"CveYear":"2018","CveId":"5121","Ordinal":"1","NoteData":"Low descenders on some Tibetan characters in several fonts on OS X are clipped when rendered in the addressbar. When used as part of an Internationalized Domain Name (IDN) this can be used for domain name spoofing attacks. Note: This attack only affects OS X operating systems. Other operating systems are unaffected. This vulnerability affects Firefox < 58.","Type":"Description","Title":null},{"CveYear":"2018","CveId":"5121","Ordinal":"2","NoteData":"2018-06-11","Type":"Other","Title":"Published"},{"CveYear":"2018","CveId":"5121","Ordinal":"3","NoteData":"2018-06-12","Type":"Other","Title":"Modified"}]}}}