{"id":"CVE-2021-34146","aliases":["DEBIAN-CVE-2021-34146","EUVD-2021-20808","GHSA-jg54-6p86-rp5q","UBUNTU-CVE-2021-34146"],"status":"published","title":"The Bluetooth Classic implementation in the Cypress CYW920735Q60EVB does not properly handle the...","description":"The Bluetooth Classic implementation in the Cypress CYW920735Q60EVB does not properly handle the reception of continuous unsolicited LMP responses, allowing attackers in radio range to trigger a denial of service and restart (crash) of the device by flooding it with LMP_AU_Rand packets after the paging procedure.","severity":{"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","from":"nvd"},"epss":{"day":"2026-11-11","score":0.00586,"percentile":0.48454,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"published":"2021-09-07T06:18:00Z","modified":"2026-10-23T18:03:27Z","fixes":[{"ecosystem":"Debian:12","package":"bluez-firmware","fixed_in":["1.2-8"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"bluez-firmware","fixed_in":["1.2-8"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"bluez-firmware","fixed_in":["1.2-8"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"bluez-firmware","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.2-8"}]}],"versions":["1.0-2","1.0-3","1.2-1","1.2-2","1.2-3","1.2-4","1.2-5","1.2-6","1.2-7","1.2-7~bpo11+1","1.2-8~bpo11+1"]},{"source":"osv","ecosystem":"Debian:13","package":"bluez-firmware","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.2-8"}]}],"versions":["1.0-2","1.0-3","1.2-1","1.2-2","1.2-3","1.2-4","1.2-5","1.2-6","1.2-7","1.2-7~bpo11+1","1.2-8~bpo11+1"]},{"source":"osv","ecosystem":"Debian:14","package":"bluez-firmware","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.2-8"}]}],"versions":["1.0-2","1.0-3","1.2-1","1.2-2","1.2-3","1.2-4","1.2-5","1.2-6","1.2-7","1.2-7~bpo11+1","1.2-8~bpo11+1"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"bluez-firmware","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.2-7"]}],"products":[{"vendor":"cypress","product":"cyw20735b1_firmware"},{"vendor":"cypress","product":"cyw920735q60evb-01_firmware"}],"references":[{"url":"https://www.cypress.com/documentation/datasheets/cyw20735b1-single-chip-bluetooth-transceiver-wireless-input-devices","tags":["x_refsource_MISC","x_transferred","Vendor Advisory","advisory"]},{"url":"https://dl.packetstormsecurity.net/papers/general/braktooth.pdf","tags":["x_refsource_MISC","x_transferred","Technical Description","Third Party Advisory","advisory","article"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-34146"},{"url":"https://github.com/advisories/GHSA-jg54-6p86-rp5q"},{"url":"https://security-tracker.debian.org/tracker/CVE-2021-34146","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2021-34146","tags":["report"]},{"url":"https://github.com/RPi-Distro/bluez-firmware/commit/31ad68831357d2019624004f1f0846475671088f","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-34146","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2021-34146","description":"The Bluetooth Classic implementation in the Cypress CYW920735Q60EVB does not properly handle the reception of continuous unsolicited LMP responses, allowing attackers in radio range to trigger a denial of service and restart (crash) of the device by flooding it with LMP_AU_Rand packets after the paging procedure.","status":"published","published":"2021-09-07T06:18:00Z","modified":"2024-08-04T00:05:52.435Z","updated_at":"2026-11-02T14:33:11.59359Z"}],"euvd":[{"id":"EUVD-2021-20808","description":"The Bluetooth Classic implementation in the Cypress CYW920735Q60EVB does not properly handle the reception of continuous unsolicited LMP responses, allowing attackers in radio range to trigger a denial of service and restart (crash) of the device by flooding it with LMP_AU_Rand packets after the paging procedure.","status":"published","published":"2021-09-07T06:18:00Z","modified":"2024-08-04T00:05:52Z","updated_at":"2026-11-03T03:24:32.880562Z"}],"ghsa":[{"id":"GHSA-jg54-6p86-rp5q","title":"The Bluetooth Classic implementation in the Cypress CYW920735Q60EVB does not properly handle the...","description":"The Bluetooth Classic implementation in the Cypress CYW920735Q60EVB does not properly handle the reception of continuous unsolicited LMP responses, allowing attackers in radio range to trigger a denial of service and restart (crash) of the device by flooding it with LMP_AU_Rand packets after the paging procedure.","status":"published","published":"2022-05-24T19:13:15Z","modified":"2023-01-30T05:01:55Z","updated_at":"2026-11-02T14:46:31.204916Z"}],"nvd":[{"id":"CVE-2021-34146","description":"The Bluetooth Classic implementation in the Cypress CYW920735Q60EVB does not properly handle the reception of continuous unsolicited LMP responses, allowing attackers in radio range to trigger a denial of service and restart (crash) of the device by flooding it with LMP_AU_Rand packets after the paging procedure.","status":"published","published":"2021-09-07T07:15:07.327Z","modified":"2026-06-17T03:55:30.75Z","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","assessor":"primary"},{"version":"2.0","score":6.1,"vector":"AV:A/AC:L/Au:N/C:N/I:N/A:C","level":"medium","assessor":"primary"}],"updated_at":"2026-11-02T14:06:58.05696Z"}],"osv":[{"id":"CVE-2021-34146","description":"The Bluetooth Classic implementation in the Cypress CYW920735Q60EVB does not properly handle the reception of continuous unsolicited LMP responses, allowing attackers in radio range to trigger a denial of service and restart (crash) of the device by flooding it with LMP_AU_Rand packets after the paging procedure.","status":"published","published":"2021-09-07T07:15:07Z","modified":"2026-04-10T04:34:25.017634Z","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"}],"updated_at":"2026-11-02T15:44:20.13324Z"},{"id":"DEBIAN-CVE-2021-34146","description":"The Bluetooth Classic implementation in the Cypress CYW920735Q60EVB does not properly handle the reception of continuous unsolicited LMP responses, allowing attackers in radio range to trigger a denial of service and restart (crash) of the device by flooding it with LMP_AU_Rand packets after the paging procedure.","status":"published","published":"2021-09-07T07:15:07.327Z","modified":"2026-10-23T18:03:27.211492683Z","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"}],"updated_at":"2026-11-02T15:45:35.233346Z"},{"id":"UBUNTU-CVE-2021-34146","description":"The Bluetooth Classic implementation in the Cypress CYW920735Q60EVB does not properly handle the reception of continuous unsolicited LMP responses, allowing attackers in radio range to trigger a denial of service and restart (crash) of the device by flooding it with LMP_AU_Rand packets after the paging procedure.","status":"published","published":"2021-09-07T07:15:00Z","modified":"2025-09-08T16:47:13Z","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"}],"updated_at":"2026-11-02T15:54:27.870979Z"}]}}