{"id":"CVE-2020-9866","aliases":["EUVD-2020-30645","GHSA-39x7-9p46-59cg"],"status":"published","title":"A buffer overflow was addressed with improved bounds checking. This issue is fixed in macOS...","description":"A buffer overflow was addressed with improved bounds checking. This issue is fixed in macOS Catalina 10.15.6, Security Update 2020-004 Mojave, Security Update 2020-004 High Sierra. A buffer overflow may result in arbitrary code execution.","severity":{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.01947,"percentile":0.80371,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-120"],"published":"2020-10-27T20:42:18Z","modified":"2026-06-17T03:28:42Z","products":[{"vendor":"apple","product":"mac_os_x"},{"vendor":"apple","product":"macos"}],"references":[{"url":"https://support.apple.com/en-us/HT211289","tags":["x_refsource_MISC","x_transferred","Release Notes","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-9866"},{"url":"https://github.com/advisories/GHSA-39x7-9p46-59cg"}],"sources":{"cve":[{"id":"CVE-2020-9866","description":"A buffer overflow was addressed with improved bounds checking. This issue is fixed in macOS Catalina 10.15.6, Security Update 2020-004 Mojave, Security Update 2020-004 High Sierra. A buffer overflow may result in arbitrary code execution.","status":"published","published":"2020-10-27T20:42:18Z","modified":"2024-08-04T10:43:05.399Z","updated_at":"2026-11-02T14:35:49.538427Z"}],"euvd":[{"id":"EUVD-2020-30645","description":"A buffer overflow was addressed with improved bounds checking. This issue is fixed in macOS Catalina 10.15.6, Security Update 2020-004 Mojave, Security Update 2020-004 High Sierra. A buffer overflow may result in arbitrary code execution.","status":"published","published":"2020-10-27T20:42:18Z","modified":"2024-08-04T10:43:05Z","updated_at":"2026-11-03T03:07:52.605769Z"}],"ghsa":[{"id":"GHSA-39x7-9p46-59cg","title":"A buffer overflow was addressed with improved bounds checking. This issue is fixed in macOS...","description":"A buffer overflow was addressed with improved bounds checking. This issue is fixed in macOS Catalina 10.15.6, Security Update 2020-004 Mojave, Security Update 2020-004 High Sierra. A buffer overflow may result in arbitrary code execution.","status":"published","published":"2022-05-24T17:32:45Z","modified":"2023-01-29T05:04:36Z","cwes":["CWE-120"],"updated_at":"2026-11-02T14:45:35.654176Z"}],"nvd":[{"id":"CVE-2020-9866","description":"A buffer overflow was addressed with improved bounds checking. This issue is fixed in macOS Catalina 10.15.6, Security Update 2020-004 Mojave, Security Update 2020-004 High Sierra. A buffer overflow may result in arbitrary code execution.","status":"published","published":"2020-10-27T21:15:15.633Z","modified":"2026-06-17T03:28:42.59Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"},{"version":"2.0","score":7.5,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","level":"high","assessor":"primary"}],"cwes":["CWE-120"],"updated_at":"2026-11-02T14:06:21.80969Z"}]}}