{"api_version":"1","generated_at":"2026-07-23T13:42:42+00:00","cve":"CVE-2021-29958","urls":{"html":"https://cve.report/CVE-2021-29958","api":"https://cve.report/api/cve/CVE-2021-29958.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2021-29958","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-29958"},"summary":{"title":"CVE-2021-29958","description":"When a download was initiated, the client did not check whether it was in normal or private browsing mode, which led to private mode cookies being shared in normal browsing mode. This vulnerability affects Firefox for iOS < 34.","state":"PUBLIC","assigner":"security@mozilla.org","published_at":"2021-06-24 14:15:00","updated_at":"2022-07-12 17:42:00"},"problem_types":["CWE-862"],"metrics":[],"references":[{"url":"https://www.mozilla.org/security/advisories/mfsa2021-25/","name":"https://www.mozilla.org/security/advisories/mfsa2021-25/","refsource":"MISC","tags":[],"title":"Security Vulnerabilities fixed in Firefox for iOS 34 — Mozilla","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1670127","name":"https://bugzilla.mozilla.org/show_bug.cgi?id=1670127","refsource":"MISC","tags":[],"title":"Access Denied","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-29958","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-29958","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2021","cve_id":"29958","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"mozilla","cpe5":"firefox","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"iphone_os","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[{"cve":"CVE-2021-29958","qid":"630720","title":"Mozilla Firefox For iOS Information Disclosure Vulnerability"}]},"source_records":{"cve_program":{"data_type":"CVE","data_format":"MITRE","data_version":"4.0","CVE_data_meta":{"ID":"CVE-2021-29958","ASSIGNER":"security@mozilla.org","STATE":"PUBLIC"},"affects":{"vendor":{"vendor_data":[{"vendor_name":"Mozilla","product":{"product_data":[{"product_name":"Firefox for iOS","version":{"version_data":[{"version_value":"34","version_affected":"<"}]}}]}}]}},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"File download shares private browsing mode cookies"}]}]},"references":{"reference_data":[{"url":"https://www.mozilla.org/security/advisories/mfsa2021-25/","refsource":"MISC","name":"https://www.mozilla.org/security/advisories/mfsa2021-25/"},{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1670127","refsource":"MISC","name":"https://bugzilla.mozilla.org/show_bug.cgi?id=1670127"}]},"description":{"description_data":[{"lang":"eng","value":"When a download was initiated, the client did not check whether it was in normal or private browsing mode, which led to private mode cookies being shared in normal browsing mode. This vulnerability affects Firefox for iOS < 34."}]}},"nvd":{"publishedDate":"2021-06-24 14:15:00","lastModifiedDate":"2022-07-12 17:42:00","problem_types":["CWE-862"],"metrics":{"baseMetricV3":{"cvssV3":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"LOW","integrityImpact":"NONE","availabilityImpact":"NONE","baseScore":4.3,"baseSeverity":"MEDIUM"},"exploitabilityScore":2.8,"impactScore":1.4},"baseMetricV2":{"cvssV2":{"version":"2.0","vectorString":"AV:N/AC:M/Au:N/C:P/I:N/A:N","accessVector":"NETWORK","accessComplexity":"MEDIUM","authentication":"NONE","confidentialityImpact":"PARTIAL","integrityImpact":"NONE","availabilityImpact":"NONE","baseScore":4.3},"severity":"MEDIUM","exploitabilityScore":8.6,"impactScore":2.9,"acInsufInfo":false,"obtainAllPrivilege":false,"obtainUserPrivilege":false,"obtainOtherPrivilege":false,"userInteractionRequired":true}},"configurations":{"CVE_data_version":"4.0","nodes":[{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:mozilla:firefox:*:*:*:*:*:iphone_os:*:*","versionEndExcluding":"34.0","cpe_name":[]}]}]}},"legacy_mitre":{"record":{"CveYear":"2021","CveId":"29958","Ordinal":"205189","Title":"CVE-2021-29958","CVE":"CVE-2021-29958","Year":"2021"},"notes":[{"CveYear":"2021","CveId":"29958","Ordinal":"1","NoteData":"When a download was initiated, the client did not check whether it was in normal or private browsing mode, which led to private mode cookies being shared in normal browsing mode. This vulnerability affects Firefox for iOS < 34.","Type":"Description","Title":null},{"CveYear":"2021","CveId":"29958","Ordinal":"2","NoteData":"2021-06-24","Type":"Other","Title":"Published"},{"CveYear":"2021","CveId":"29958","Ordinal":"3","NoteData":"2021-06-24","Type":"Other","Title":"Modified"}]}}}