{"id":"CVE-2021-3329","aliases":["EUVD-2021-26660","GHSA-gmxc-973j-62f2"],"status":"published","title":"DOS: Incorrect handling of the initial HCI ACL_MTU handshake packet leads to crash of bluetooth host layer","description":"Lack of proper validation in HCI Host stack initialization can cause a crash of the bluetooth stack","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":"2026-11-12","score":0.00616,"percentile":0.50046,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-665","CWE-703"],"published":"2023-02-26T00:00:00Z","modified":"2026-06-17T04:04:57Z","products":[{"vendor":"zephyrproject","product":"zephyr"},{"vendor":"zephyrproject-rtos","product":"zephyr"}],"references":[{"url":"https://zephyrprojectsec.atlassian.net/browse/ZEPSEC-117","tags":["x_transferred","Exploit","Issue Tracking","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-3329"},{"url":"https://github.com/advisories/GHSA-gmxc-973j-62f2"}],"sources":{"cve":[{"id":"CVE-2021-3329","title":"DOS: Incorrect handling of the initial HCI ACL_MTU handshake packet leads to crash of bluetooth host layer","description":"Lack of proper validation in HCI Host stack initialization can cause a crash of the bluetooth stack","status":"published","published":"2023-02-26T00:00:00Z","modified":"2025-03-11T15:25:38.906Z","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-703"],"updated_at":"2026-11-02T14:33:04.020035Z"}],"euvd":[{"id":"EUVD-2021-26660","description":"Lack of proper validation in HCI Host stack initialization can cause a crash of the bluetooth stack","status":"published","published":"2023-02-26T00:00:00Z","modified":"2025-03-11T15:25:38Z","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":"2026-11-02T20:53:07.779422Z"}],"ghsa":[{"id":"GHSA-gmxc-973j-62f2","title":"Lack of proper validation in HCI Host stack initialization can cause a crash of the bluetooth stack","description":"Lack of proper validation in HCI Host stack initialization can cause a crash of the bluetooth stack","status":"published","published":"2023-02-26T09:30:17Z","modified":"2023-03-15T05:07:12Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-665"],"updated_at":"2026-11-02T14:54:20.892008Z"}],"nvd":[{"id":"CVE-2021-3329","description":"Lack of proper validation in HCI Host stack initialization can cause a crash of the bluetooth stack","status":"published","published":"2023-02-26T07:15:10.287Z","modified":"2026-06-17T04:04:57.153Z","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":6.5,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary"}],"cwes":["CWE-703","CWE-665"],"updated_at":"2026-11-02T14:07:07.323379Z"}]}}