{"api_version":"1","generated_at":"2026-04-22T20:52:13+00:00","cve":"CVE-2021-23964","urls":{"html":"https://cve.report/CVE-2021-23964","api":"https://cve.report/api/cve/CVE-2021-23964.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2021-23964","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-23964"},"summary":{"title":"CVE-2021-23964","description":"Mozilla developers reported memory safety bugs present in Firefox 84 and Firefox ESR 78.6. 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 < 85, Thunderbird < 78.7, and Firefox ESR < 78.7.","state":"PUBLIC","assigner":"security@mozilla.org","published_at":"2021-02-26 16:15:00","updated_at":"2022-05-03 16:04:00"},"problem_types":["CWE-787"],"metrics":[],"references":[{"url":"https://bugzilla.mozilla.org/buglist.cgi?bug_id=1662507%2C1666285%2C1673526%2C1674278%2C1674835%2C1675097%2C1675844%2C1675868%2C1677590%2C1677888%2C1680410%2C1681268%2C1682068%2C1682938%2C1683736%2C1685260%2C1685925","name":"https://bugzilla.mozilla.org/buglist.cgi?bug_id=1662507%2C1666285%2C1673526%2C1674278%2C1674835%2C1675097%2C1675844%2C1675868%2C1677590%2C1677888%2C1680410%2C1681268%2C1682068%2C1682938%2C1683736%2C1685260%2C1685925","refsource":"MISC","tags":["Broken Link","Issue Tracking","Vendor Advisory"],"title":"Bug List","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://www.mozilla.org/security/advisories/mfsa2021-03/","name":"https://www.mozilla.org/security/advisories/mfsa2021-03/","refsource":"MISC","tags":["Release Notes","Vendor Advisory"],"title":"Security Vulnerabilities fixed in Firefox 85 — Mozilla","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://www.mozilla.org/security/advisories/mfsa2021-04/","name":"https://www.mozilla.org/security/advisories/mfsa2021-04/","refsource":"MISC","tags":["Release Notes","Vendor Advisory"],"title":"Security Vulnerabilities fixed in Firefox ESR 78.7 — Mozilla","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://www.mozilla.org/security/advisories/mfsa2021-05/","name":"https://www.mozilla.org/security/advisories/mfsa2021-05/","refsource":"MISC","tags":["Release Notes","Vendor Advisory"],"title":"Security Vulnerabilities fixed in Thunderbird 78.7 — Mozilla","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-23964","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-23964","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2021","cve_id":"23964","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"mozilla","cpe5":"firefox","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"23964","vulnerable":"1","versionEndIncluding":"1","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"mozilla","cpe5":"firefox","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"23964","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"mozilla","cpe5":"firefox_esr","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"23964","vulnerable":"1","versionEndIncluding":"1","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"mozilla","cpe5":"firefox_esr","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"23964","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"mozilla","cpe5":"thunderbird","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"23964","vulnerable":"1","versionEndIncluding":"1","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"mozilla","cpe5":"thunderbird","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[{"cve":"CVE-2021-23964","qid":"174740","title":"SUSE Enterprise Linux Security update for MozillaFirefox (SUSE-SU-2021:0246-1)"},{"cve":"CVE-2021-23964","qid":"179721","title":"Debian Security Update for firefox-esrthunderbird (CVE-2021-23964)"},{"cve":"CVE-2021-23964","qid":"296065","title":"Oracle Solaris 11.4 Support Repository Update (SRU) 39.107.1 Missing (CPUOCT2021)"},{"cve":"CVE-2021-23964","qid":"296069","title":"Oracle Solaris 11.4 Support Repository Update (SRU) 31.88.5 Missing (CPUJAN2021)"},{"cve":"CVE-2021-23964","qid":"375430","title":"SeaMonkey Multiple Vulnerabilities"},{"cve":"CVE-2021-23964","qid":"500940","title":"Alpine Linux Security Update for firefox-esr"},{"cve":"CVE-2021-23964","qid":"501554","title":"Alpine Linux Security Update for firefox"},{"cve":"CVE-2021-23964","qid":"501623","title":"Alpine Linux Security Update for mozjs78"},{"cve":"CVE-2021-23964","qid":"502378","title":"Alpine Linux Security Update for thunderbird"},{"cve":"CVE-2021-23964","qid":"503845","title":"Alpine Linux Security Update for firefox"},{"cve":"CVE-2021-23964","qid":"750377","title":"OpenSUSE Security Update for MozillaFirefox (openSUSE-SU-2021:0223-1)"},{"cve":"CVE-2021-23964","qid":"750378","title":"OpenSUSE Security Update for MozillaFirefox (openSUSE-SU-2021:0222-1)"},{"cve":"CVE-2021-23964","qid":"750379","title":"OpenSUSE Security Update for MozillaThunderbird (openSUSE-SU-2021:0208-1)"},{"cve":"CVE-2021-23964","qid":"750380","title":"OpenSUSE Security Update for MozillaThunderbird (openSUSE-SU-2021:0209-1)"}]},"source_records":{"cve_program":{"data_type":"CVE","data_format":"MITRE","data_version":"4.0","CVE_data_meta":{"ID":"CVE-2021-23964","ASSIGNER":"security@mozilla.org","STATE":"PUBLIC"},"affects":{"vendor":{"vendor_data":[{"vendor_name":"Mozilla","product":{"product_data":[{"product_name":"Firefox","version":{"version_data":[{"version_value":"< 85"}]}},{"product_name":"Thunderbird","version":{"version_data":[{"version_value":"< 78.7"}]}},{"product_name":"Firefox ESR","version":{"version_data":[{"version_value":"< 78.7"}]}}]}}]}},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"Memory safety bugs fixed in Firefox 85 and Firefox ESR 78.7"}]}]},"references":{"reference_data":[{"url":"https://www.mozilla.org/security/advisories/mfsa2021-03/","refsource":"MISC","name":"https://www.mozilla.org/security/advisories/mfsa2021-03/"},{"url":"https://www.mozilla.org/security/advisories/mfsa2021-04/","refsource":"MISC","name":"https://www.mozilla.org/security/advisories/mfsa2021-04/"},{"url":"https://www.mozilla.org/security/advisories/mfsa2021-05/","refsource":"MISC","name":"https://www.mozilla.org/security/advisories/mfsa2021-05/"},{"url":"https://bugzilla.mozilla.org/buglist.cgi?bug_id=1662507%2C1666285%2C1673526%2C1674278%2C1674835%2C1675097%2C1675844%2C1675868%2C1677590%2C1677888%2C1680410%2C1681268%2C1682068%2C1682938%2C1683736%2C1685260%2C1685925","refsource":"MISC","name":"https://bugzilla.mozilla.org/buglist.cgi?bug_id=1662507%2C1666285%2C1673526%2C1674278%2C1674835%2C1675097%2C1675844%2C1675868%2C1677590%2C1677888%2C1680410%2C1681268%2C1682068%2C1682938%2C1683736%2C1685260%2C1685925"}]},"description":{"description_data":[{"lang":"eng","value":"Mozilla developers reported memory safety bugs present in Firefox 84 and Firefox ESR 78.6. 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 < 85, Thunderbird < 78.7, and Firefox ESR < 78.7."}]}},"nvd":{"publishedDate":"2021-02-26 16:15:00","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:*:*:*:*:*:*:*:*","versionEndExcluding":"85.0","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*","versionEndExcluding":"78.7","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*","versionEndExcluding":"78.7","cpe_name":[]}]}]}},"legacy_mitre":{"record":{"CveYear":"2021","CveId":"23964","Ordinal":"198720","Title":"CVE-2021-23964","CVE":"CVE-2021-23964","Year":"2021"},"notes":[{"CveYear":"2021","CveId":"23964","Ordinal":"1","NoteData":"Mozilla developers reported memory safety bugs present in Firefox 84 and Firefox ESR 78.6. 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 < 85, Thunderbird < 78.7, and Firefox ESR < 78.7.","Type":"Description","Title":null},{"CveYear":"2021","CveId":"23964","Ordinal":"2","NoteData":"2021-02-26","Type":"Other","Title":"Published"},{"CveYear":"2021","CveId":"23964","Ordinal":"3","NoteData":"2021-02-26","Type":"Other","Title":"Modified"}]}}}