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{"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"}