{"id":"CVE-2021-31786","aliases":["EUVD-2021-18667","GHSA-g4j2-r5x5-83p7"],"status":"published","title":"The Bluetooth Classic Audio implementation on Actions ATS2815 and ATS2819 devices does not...","description":"The Bluetooth Classic Audio implementation on Actions ATS2815 and ATS2819 devices does not properly handle a connection attempt from a host with the same BDAddress as the current connected BT host, allowing attackers to trigger a disconnection and deadlock of the device by connecting with a forged BDAddress that matches the original connected host.","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":0.00446,"percentile":0.39264,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-667"],"published":"2021-09-07T06:05:49Z","modified":"2026-06-17T03:52:14Z","products":[{"vendor":"actions-semi","product":"ats2815_firmware"},{"vendor":"actions-semi","product":"ats2819_firmware"},{"vendor":"actions-semi","product":"ats2819p_firmware"},{"vendor":"actions-semi","product":"ats2819s_firmware"},{"vendor":"actions-semi","product":"ats2819t_firmware"}],"references":[{"url":"https://www.actions-semi.com/index.php?id=3581\u0026siteId=4","tags":["x_refsource_MISC","x_transferred","Broken Link","Vendor Advisory"]},{"url":"https://launchstudio.bluetooth.com/ListingDetails/76427","tags":["x_refsource_MISC","x_transferred","Third Party Advisory"]},{"url":"https://dl.packetstormsecurity.net/papers/general/braktooth.pdf","tags":["x_refsource_MISC","x_transferred","Technical Description","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-31786"},{"url":"https://github.com/advisories/GHSA-g4j2-r5x5-83p7"}],"sources":{"cve":[{"id":"CVE-2021-31786","description":"The Bluetooth Classic Audio implementation on Actions ATS2815 and ATS2819 devices does not properly handle a connection attempt from a host with the same BDAddress as the current connected BT host, allowing attackers to trigger a disconnection and deadlock of the device by connecting with a forged BDAddress that matches the original connected host.","status":"published","published":"2021-09-07T06:05:49Z","modified":"2024-08-03T23:10:29.942Z","updated_at":"2026-11-02T14:33:05.665371Z"}],"euvd":[{"id":"EUVD-2021-18667","description":"The Bluetooth Classic Audio implementation on Actions ATS2815 and ATS2819 devices does not properly handle a connection attempt from a host with the same BDAddress as the current connected BT host, allowing attackers to trigger a disconnection and deadlock of the device by connecting with a forged BDAddress that matches the original connected host.","status":"published","published":"2021-09-07T06:05:49Z","modified":"2024-08-03T23:10:29Z","updated_at":"2026-11-03T03:24:38.423371Z"}],"ghsa":[{"id":"GHSA-g4j2-r5x5-83p7","title":"The Bluetooth Classic Audio implementation on Actions ATS2815 and ATS2819 devices does not...","description":"The Bluetooth Classic Audio implementation on Actions ATS2815 and ATS2819 devices does not properly handle a connection attempt from a host with the same BDAddress as the current connected BT host, allowing attackers to trigger a disconnection and deadlock of the device by connecting with a forged BDAddress that matches the original connected host.","status":"published","published":"2022-05-24T19:13:16Z","modified":"2023-01-27T05:03:57Z","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":"2026-11-02T14:42:21.502511Z"}],"nvd":[{"id":"CVE-2021-31786","description":"The Bluetooth Classic Audio implementation on Actions ATS2815 and ATS2819 devices does not properly handle a connection attempt from a host with the same BDAddress as the current connected BT host, allowing attackers to trigger a disconnection and deadlock of the device by connecting with a forged BDAddress that matches the original connected host.","status":"published","published":"2021-09-07T07:15:07.19Z","modified":"2026-06-17T03:52:14.147Z","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"}],"cwes":["CWE-667"],"updated_at":"2026-11-02T14:06:58.05696Z"}]}}