{"api_version":"1","generated_at":"2026-04-23T02:37:51+00:00","cve":"CVE-2021-29966","urls":{"html":"https://cve.report/CVE-2021-29966","api":"https://cve.report/api/cve/CVE-2021-29966.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2021-29966","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-29966"},"summary":{"title":"CVE-2021-29966","description":"Mozilla developers reported memory safety bugs present in Firefox 88. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 89.","state":"PUBLIC","assigner":"security@mozilla.org","published_at":"2021-06-24 14:15:00","updated_at":"2022-05-03 16:04:00"},"problem_types":["CWE-787"],"metrics":[],"references":[{"url":"https://security.gentoo.org/glsa/202107-09","name":"GLSA-202107-09","refsource":"GENTOO","tags":[],"title":"Mozilla Firefox: Multiple vulnerabilities (GLSA 202107-09) — Gentoo security","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://www.mozilla.org/security/advisories/mfsa2021-23/","name":"https://www.mozilla.org/security/advisories/mfsa2021-23/","refsource":"MISC","tags":[],"title":"Security Vulnerabilities fixed in Firefox 89 — Mozilla","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://bugzilla.mozilla.org/buglist.cgi?bug_id=1660307%2C1686154%2C1702948%2C1708124","name":"https://bugzilla.mozilla.org/buglist.cgi?bug_id=1660307%2C1686154%2C1702948%2C1708124","refsource":"MISC","tags":[],"title":"Bug List","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-29966","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-29966","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2021","cve_id":"29966","vulnerable":"1","versionEndIncluding":"","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":[{"cve":"CVE-2021-29966","qid":"198397","title":"Ubuntu Security Notification for Firefox vulnerabilities (USN-4978-1)"},{"cve":"CVE-2021-29966","qid":"375606","title":"Mozilla Firefox Multiple Vulnerabilities (MFSA2021-23)"},{"cve":"CVE-2021-29966","qid":"501558","title":"Alpine Linux Security Update for firefox"},{"cve":"CVE-2021-29966","qid":"503849","title":"Alpine Linux Security Update for firefox"},{"cve":"CVE-2021-29966","qid":"630721","title":"Mozilla Firefox For Android Multiple Vulnerabilities"},{"cve":"CVE-2021-29966","qid":"710067","title":"Gentoo Linux Mozilla Firefox Multiple Vulnerabilities (GLSA 202107-09)"}]},"source_records":{"cve_program":{"data_type":"CVE","data_format":"MITRE","data_version":"4.0","CVE_data_meta":{"ID":"CVE-2021-29966","ASSIGNER":"security@mozilla.org","STATE":"PUBLIC"},"affects":{"vendor":{"vendor_data":[{"vendor_name":"Mozilla","product":{"product_data":[{"product_name":"Firefox","version":{"version_data":[{"version_value":"89","version_affected":"<"}]}}]}}]}},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"Memory safety bugs fixed in Firefox 89"}]}]},"references":{"reference_data":[{"url":"https://www.mozilla.org/security/advisories/mfsa2021-23/","refsource":"MISC","name":"https://www.mozilla.org/security/advisories/mfsa2021-23/"},{"url":"https://bugzilla.mozilla.org/buglist.cgi?bug_id=1660307%2C1686154%2C1702948%2C1708124","refsource":"MISC","name":"https://bugzilla.mozilla.org/buglist.cgi?bug_id=1660307%2C1686154%2C1702948%2C1708124"},{"refsource":"GENTOO","name":"GLSA-202107-09","url":"https://security.gentoo.org/glsa/202107-09"}]},"description":{"description_data":[{"lang":"eng","value":"Mozilla developers reported memory safety bugs present in Firefox 88. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 89."}]}},"nvd":{"publishedDate":"2021-06-24 14:15:00","lastModifiedDate":"2022-05-03 16:04:00","problem_types":["CWE-787"],"metrics":{"baseMetricV3":{"cvssV3":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH","baseScore":8.8,"baseSeverity":"HIGH"},"exploitabilityScore":2.8,"impactScore":5.9},"baseMetricV2":{"cvssV2":{"version":"2.0","vectorString":"AV:N/AC:M/Au:N/C:P/I:P/A:P","accessVector":"NETWORK","accessComplexity":"MEDIUM","authentication":"NONE","confidentialityImpact":"PARTIAL","integrityImpact":"PARTIAL","availabilityImpact":"PARTIAL","baseScore":6.8},"severity":"MEDIUM","exploitabilityScore":8.6,"impactScore":6.4,"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:*:*:*:*:*:*:*:*","versionStartIncluding":"78.11.0","versionEndExcluding":"89.0","cpe_name":[]}]}]}},"legacy_mitre":{"record":{"CveYear":"2021","CveId":"29966","Ordinal":"205197","Title":"CVE-2021-29966","CVE":"CVE-2021-29966","Year":"2021"},"notes":[{"CveYear":"2021","CveId":"29966","Ordinal":"1","NoteData":"Mozilla developers reported memory safety bugs present in Firefox 88. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 89.","Type":"Description","Title":null},{"CveYear":"2021","CveId":"29966","Ordinal":"2","NoteData":"2021-06-24","Type":"Other","Title":"Published"},{"CveYear":"2021","CveId":"29966","Ordinal":"3","NoteData":"2021-07-07","Type":"Other","Title":"Modified"}]}}}