{"id":"CVE-2021-3966","aliases":["EUVD-2021-27171"],"status":"published","title":"Usb bluetooth device ACL read cb buffer overflow","description":"usb device bluetooth class includes a buffer overflow related to implementation of net_buf_add_mem.","severity":{"version":"3.1","score":9.6,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:H","level":"critical","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.005,"percentile":0.43191,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-120","CWE-122"],"published":"2023-01-11T00:00:00Z","modified":"2026-06-17T04:06:18Z","products":[{"vendor":"zephyrproject","product":"zephyr"},{"vendor":"zephyrproject-rtos","product":"zephyr"}],"references":[{"url":"https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-hfxq-3w6x-fv2m","tags":["x_transferred","Third Party Advisory"]}],"sources":{"cve":[{"id":"CVE-2021-3966","title":"Usb bluetooth device ACL read cb buffer overflow","description":"usb device bluetooth class includes a buffer overflow related to implementation of net_buf_add_mem.","status":"published","published":"2023-01-11T00:00:00Z","modified":"2025-04-09T18:29:11.461Z","cvss":[{"version":"3.1","score":9.6,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:H","level":"critical","assessor":"cna"}],"cwes":["CWE-122"],"updated_at":"2026-11-02T14:33:04.020035Z"}],"euvd":[{"id":"EUVD-2021-27171","description":"usb device bluetooth class includes a buffer overflow related to implementation of net_buf_add_mem.","status":"published","published":"2023-01-11T00:00:00Z","modified":"2025-04-09T18:29:11Z","cvss":[{"version":"3.1","score":9.6,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T20:52:38.263259Z"}],"nvd":[{"id":"CVE-2021-3966","description":"usb device bluetooth class includes a buffer overflow related to implementation of net_buf_add_mem.","status":"published","published":"2023-01-11T05:15:10.94Z","modified":"2026-06-17T04:06:18.207Z","cvss":[{"version":"3.1","score":9.6,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:H","level":"critical","assessor":"secondary"},{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"primary"}],"cwes":["CWE-122","CWE-120"],"updated_at":"2026-11-02T14:07:07.323379Z"}]}}