{"api_version":"1","generated_at":"2026-04-23T04:11:05+00:00","cve":"CVE-2020-12387","urls":{"html":"https://cve.report/CVE-2020-12387","api":"https://cve.report/api/cve/CVE-2020-12387.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2020-12387","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2020-12387"},"summary":{"title":"CVE-2020-12387","description":"A race condition when running shutdown code for Web Worker led to a use-after-free vulnerability. This resulted in a potentially exploitable crash. This vulnerability affects Firefox ESR < 68.8, Firefox < 76, and Thunderbird < 68.8.0.","state":"PUBLIC","assigner":"security@mozilla.org","published_at":"2020-05-26 18:15:00","updated_at":"2021-12-14 20:23:00"},"problem_types":["CWE-362","CWE-416"],"metrics":[],"references":[{"url":"https://usn.ubuntu.com/4373-1/","name":"USN-4373-1","refsource":"UBUNTU","tags":[],"title":"USN-4373-1: Thunderbird vulnerabilities | Ubuntu security notices | Ubuntu","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://www.mozilla.org/security/advisories/mfsa2020-17/","name":"https://www.mozilla.org/security/advisories/mfsa2020-17/","refsource":"MISC","tags":["Third Party Advisory"],"title":"Security Vulnerabilities fixed in Firefox ESR 68.8 — Mozilla","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://www.mozilla.org/security/advisories/mfsa2020-16/","name":"https://www.mozilla.org/security/advisories/mfsa2020-16/","refsource":"MISC","tags":["Third Party Advisory"],"title":"Security Vulnerabilities fixed in Firefox 76 — Mozilla","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1545345","name":"https://bugzilla.mozilla.org/show_bug.cgi?id=1545345","refsource":"MISC","tags":["Permissions Required"],"title":"Access Denied","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://security.gentoo.org/glsa/202005-04","name":"https://security.gentoo.org/glsa/202005-04","refsource":"MISC","tags":[],"title":"Mozilla Firefox: Multiple vulnerabilities (GLSA 202005-04) — Gentoo security","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://www.mozilla.org/security/advisories/mfsa2020-18/","name":"https://www.mozilla.org/security/advisories/mfsa2020-18/","refsource":"MISC","tags":["Third Party Advisory"],"title":"Security Vulnerabilities fixed in Thunderbird 68.8.0 — Mozilla","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://security.gentoo.org/glsa/202005-03","name":"https://security.gentoo.org/glsa/202005-03","refsource":"MISC","tags":[],"title":"Mozilla Thunderbird: Multiple vulnerabilities (GLSA 202005-03) — Gentoo security","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://www.cve.org/CVERecord?id=CVE-2020-12387","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-12387","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2020","cve_id":"12387","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"mozilla","cpe5":"firefox","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2020","cve_id":"12387","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":"2020","cve_id":"12387","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":"2020","cve_id":"12387","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":"2020","cve_id":"12387","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"mozilla","cpe5":"thunderbird","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2020","cve_id":"12387","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-2020-12387","qid":"296074","title":"Oracle Solaris 11.4 Support Repository Update (SRU) 22.69.4 Missing (CPUAPR2020)"},{"cve":"CVE-2020-12387","qid":"376945","title":"Alibaba Cloud Linux Security Update for firefox (ALINUX2-SA-2020:0093)"},{"cve":"CVE-2020-12387","qid":"500930","title":"Alpine Linux Security Update for firefox-esr"},{"cve":"CVE-2020-12387","qid":"500949","title":"Alpine Linux Security Update for firefox"},{"cve":"CVE-2020-12387","qid":"501078","title":"Alpine Linux Security Update for mozjs68"},{"cve":"CVE-2020-12387","qid":"502374","title":"Alpine Linux Security Update for thunderbird"},{"cve":"CVE-2020-12387","qid":"503834","title":"Alpine Linux Security Update for firefox"},{"cve":"CVE-2020-12387","qid":"505442","title":"Alpine Linux Security Update for thunderbird"}]},"source_records":{"cve_program":{"data_type":"CVE","data_format":"MITRE","data_version":"4.0","CVE_data_meta":{"ID":"CVE-2020-12387","ASSIGNER":"security@mozilla.org","STATE":"PUBLIC"},"affects":{"vendor":{"vendor_data":[{"vendor_name":"Mozilla","product":{"product_data":[{"product_name":"Firefox ESR","version":{"version_data":[{"version_value":"68.8","version_affected":"<"}]}},{"product_name":"Firefox","version":{"version_data":[{"version_value":"76","version_affected":"<"}]}},{"product_name":"Thunderbird","version":{"version_data":[{"version_value":"68.8.0","version_affected":"<"}]}}]}}]}},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"Use-after-free during worker shutdown"}]}]},"references":{"reference_data":[{"url":"https://www.mozilla.org/security/advisories/mfsa2020-18/","refsource":"MISC","name":"https://www.mozilla.org/security/advisories/mfsa2020-18/"},{"url":"https://www.mozilla.org/security/advisories/mfsa2020-16/","refsource":"MISC","name":"https://www.mozilla.org/security/advisories/mfsa2020-16/"},{"url":"https://www.mozilla.org/security/advisories/mfsa2020-17/","refsource":"MISC","name":"https://www.mozilla.org/security/advisories/mfsa2020-17/"},{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1545345","refsource":"MISC","name":"https://bugzilla.mozilla.org/show_bug.cgi?id=1545345"},{"refsource":"UBUNTU","name":"USN-4373-1","url":"https://usn.ubuntu.com/4373-1/"},{"refsource":"MISC","name":"https://security.gentoo.org/glsa/202005-03","url":"https://security.gentoo.org/glsa/202005-03"},{"refsource":"MISC","name":"https://security.gentoo.org/glsa/202005-04","url":"https://security.gentoo.org/glsa/202005-04"}]},"description":{"description_data":[{"lang":"eng","value":"A race condition when running shutdown code for Web Worker led to a use-after-free vulnerability. This resulted in a potentially exploitable crash. This vulnerability affects Firefox ESR < 68.8, Firefox < 76, and Thunderbird < 68.8.0."}]}},"nvd":{"publishedDate":"2020-05-26 18:15:00","lastModifiedDate":"2021-12-14 20:23:00","problem_types":["CWE-362","CWE-416"],"metrics":{"baseMetricV3":{"cvssV3":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH","baseScore":8.1,"baseSeverity":"HIGH"},"exploitabilityScore":2.2,"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":false}},"configurations":{"CVE_data_version":"4.0","nodes":[{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*","versionEndExcluding":"68.8.0","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*","versionEndExcluding":"76.0","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*","versionEndExcluding":"68.8.0","cpe_name":[]}]}]}},"legacy_mitre":{"record":{"CveYear":"2020","CveId":"12387","Ordinal":"173547","Title":"CVE-2020-12387","CVE":"CVE-2020-12387","Year":"2020"},"notes":[{"CveYear":"2020","CveId":"12387","Ordinal":"1","NoteData":"A race condition when running shutdown code for Web Worker led to a use-after-free vulnerability. This resulted in a potentially exploitable crash. This vulnerability affects Firefox ESR < 68.8, Firefox < 76, and Thunderbird < 68.8.0.","Type":"Description","Title":null},{"CveYear":"2020","CveId":"12387","Ordinal":"2","NoteData":"2020-05-26","Type":"Other","Title":"Published"},{"CveYear":"2020","CveId":"12387","Ordinal":"3","NoteData":"2020-06-12","Type":"Other","Title":"Modified"}]}}}