CVE-2020-12387

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{"affected": [{"affectedData": [{"product": "Firefox ESR", "vendor": "Mozilla", "versions": [{"lessThan": "68.8", "status": "affected", "version": "unspecified", "versionType": "custom"}]}, {"product": "Firefox", "vendor": "Mozilla", "versions": [{"lessThan": "76", "status": "affected", "version": "unspecified", "versionType": "custom"}]}, {"product": "Thunderbird", "vendor": "Mozilla", "versions": [{"lessThan": "68.8.0", "status": "affected", "version": "unspecified", "versionType": "custom"}]}], "source": "security@mozilla.org"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*", "matchCriteriaId": "5D1E5067-8D55-4C70-B5D2-31BAB1D22F50", "versionEndExcluding": "76.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*", "matchCriteriaId": "B606E5B1-C0CA-4673-9FBA-59E0C869F2C4", "versionEndExcluding": "68.8.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*", "matchCriteriaId": "E93B3D35-5D8E-4583-922F-D391CB7B992D", "versionEndExcluding": "68.8.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "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."}, {"lang": "es", "value": "Una condici\u00f3n de carrera cuando se ejecuta el c\u00f3digo shutdown para Web Worker conllevo a una vulnerabilidad de uso de la memoria previamente liberada. Esto result\u00f3 en un bloqueo potencialmente explotable. Esta vulnerabilidad afecta a Firefox ESR versiones anteriores a 68.8, Firefox versiones anteriores a 76 y Thunderbird versiones anteriores a 68.8.0."}], "id": "CVE-2020-12387", "lastModified": "2026-06-17T02:51:44.313", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "MEDIUM", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 6.8, "confidentialityImpact": "PARTIAL", "integrityImpact": "PARTIAL", "vectorString": "AV:N/AC:M/Au:N/C:P/I:P/A:P", "version": "2.0"}, "exploitabilityScore": 8.6, "impactScore": 6.4, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2020-05-26T18:15:10.980", "references": [{"source": "security@mozilla.org", "tags": ["Issue Tracking", "Permissions Required"], "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1545345"}, {"source": "security@mozilla.org", "tags": ["Third Party Advisory"], "url": "https://security.gentoo.org/glsa/202005-03"}, {"source": "security@mozilla.org", "tags": ["Third Party Advisory"], "url": "https://security.gentoo.org/glsa/202005-04"}, {"source": "security@mozilla.org", "tags": ["Broken Link"], "url": "https://usn.ubuntu.com/4373-1/"}, {"source": "security@mozilla.org", "tags": ["Third Party Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2020-16/"}, {"source": "security@mozilla.org", "tags": ["Third Party Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2020-17/"}, {"source": "security@mozilla.org", "tags": ["Third Party Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2020-18/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Issue Tracking", "Permissions Required"], "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1545345"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://security.gentoo.org/glsa/202005-03"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://security.gentoo.org/glsa/202005-04"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Broken Link"], "url": "https://usn.ubuntu.com/4373-1/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2020-16/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2020-17/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2020-18/"}], "sourceIdentifier": "security@mozilla.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-362"}, {"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"acknowledgement": "Red Hat would like to thank the Mozilla project for reporting this issue. Upstream acknowledges Looben Yang as the original reporter.", "affected_release": [{"advisory": "RHSA-2020:2036", "cpe": "cpe:/o:redhat:enterprise_linux:6", "package": "firefox-0:68.8.0-1.el6_10", "product_name": "Red Hat Enterprise Linux 6", "release_date": "2020-05-06T00:00:00Z"}, {"advisory": "RHSA-2020:2049", "cpe": "cpe:/o:redhat:enterprise_linux:6", "package": "thunderbird-0:68.8.0-1.el6_10", "product_name": "Red Hat Enterprise Linux 6", "release_date": "2020-05-11T00:00:00Z"}, {"advisory": "RHSA-2020:2037", "cpe": "cpe:/o:redhat:enterprise_linux:7", "package": "firefox-0:68.8.0-1.el7_8", "product_name": "Red Hat Enterprise Linux 7", "release_date": "2020-05-06T00:00:00Z"}, {"advisory": "RHSA-2020:2050", "cpe": "cpe:/o:redhat:enterprise_linux:7", "package": "thunderbird-0:68.8.0-1.el7_8", "product_name": "Red Hat Enterprise Linux 7", "release_date": "2020-05-11T00:00:00Z"}, {"advisory": "RHSA-2020:2031", "cpe": "cpe:/a:redhat:enterprise_linux:8", "package": "firefox-0:68.8.0-1.el8_2", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2020-05-06T00:00:00Z"}, {"advisory": "RHSA-2020:2046", "cpe": "cpe:/a:redhat:enterprise_linux:8", "package": "thunderbird-0:68.8.0-1.el8_2", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2020-05-11T00:00:00Z"}, {"advisory": "RHSA-2020:2033", "cpe": "cpe:/a:redhat:rhel_e4s:8.0", "package": "firefox-0:68.8.0-1.el8_0", "product_name": "Red Hat Enterprise Linux 8.0 Update Services for SAP Solutions", "release_date": "2020-05-06T00:00:00Z"}, {"advisory": "RHSA-2020:2048", "cpe": "cpe:/a:redhat:rhel_e4s:8.0", "package": "thunderbird-0:68.8.0-1.el8_0", "product_name": "Red Hat Enterprise Linux 8.0 Update Services for SAP Solutions", "release_date": "2020-05-11T00:00:00Z"}, {"advisory": "RHSA-2020:2032", "cpe": "cpe:/a:redhat:rhel_eus:8.1", "package": "firefox-0:68.8.0-1.el8_1", "product_name": "Red Hat Enterprise Linux 8.1 Extended Update Support", "release_date": "2020-05-06T00:00:00Z"}, {"advisory": "RHSA-2020:2047", "cpe": "cpe:/a:redhat:rhel_eus:8.1", "package": "thunderbird-0:68.8.0-1.el8_1", "product_name": "Red Hat Enterprise Linux 8.1 Extended Update Support", "release_date": "2020-05-11T00:00:00Z"}], "bugzilla": {"description": "Mozilla: Use-after-free during worker shutdown", "id": "1831761", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1831761"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.8", "cvss3_scoring_vector": "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "status": "verified"}, "cwe": "CWE-416", "details": ["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.", "A flaw was found in Mozilla Firefox and Thunderbird. When running shutdown code for Web Worker, a race condition occurs leading to a use-after-free memory flaw that could lead to an exploitable crash. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability."], "name": "CVE-2020-12387", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:5", "fix_state": "Out of support scope", "package_name": "firefox", "product_name": "Red Hat Enterprise Linux 5"}, {"cpe": "cpe:/o:redhat:enterprise_linux:5", "fix_state": "Out of support scope", "package_name": "thunderbird", "product_name": "Red Hat Enterprise Linux 5"}], "public_date": "2020-05-05T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2020-12387\nhttps://nvd.nist.gov/vuln/detail/CVE-2020-12387\nhttps://www.mozilla.org/en-US/security/advisories/mfsa2020-17/#CVE-2020-12387"], "threat_severity": "Critical"}

{}