{"id":"CVE-2021-31611","aliases":["EUVD-2021-18500","GHSA-grq2-2v86-6ppx"],"status":"published","title":"The Bluetooth Classic implementation on Zhuhai Jieli AC690X and AC692X devices does not properly...","description":"The Bluetooth Classic implementation on Zhuhai Jieli AC690X and AC692X devices does not properly handle an out-of-order LMP Setup procedure that is followed by a malformed LMP packet, allowing attackers in radio range to deadlock a device via a crafted LMP packet. The user needs to manually reboot the device to restore communication.","severity":{"version":"3.1","score":5.7,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-12","score":0.00369,"percentile":0.31192,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-667"],"published":"2021-09-07T06:03:47Z","modified":"2026-06-17T03:52:04Z","products":[{"vendor":"zh-jieli","product":"ac6901_firmware"},{"vendor":"zh-jieli","product":"ac6921_firmware"},{"vendor":"zh-jieli","product":"ac6925_firmware"},{"vendor":"zh-jieli","product":"ac6926_firmware"},{"vendor":"zh-jieli","product":"ac6928_firmware"}],"references":[{"url":"http://www.zh-jieli.com/product/68-cn.html","tags":["x_refsource_MISC","x_transferred","Vendor Advisory"]},{"url":"https://launchstudio.bluetooth.com/ListingDetails/58628","tags":["x_refsource_MISC","x_transferred","Third Party Advisory"]},{"url":"https://launchstudio.bluetooth.com/ListingDetails/19746","tags":["x_refsource_MISC","x_transferred","Third Party Advisory"]},{"url":"https://dl.packetstormsecurity.net/papers/general/braktooth.pdf","tags":["x_refsource_MISC","x_transferred","Broken Link"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-31611"},{"url":"https://github.com/advisories/GHSA-grq2-2v86-6ppx"}],"sources":{"cve":[{"id":"CVE-2021-31611","description":"The Bluetooth Classic implementation on Zhuhai Jieli AC690X and AC692X devices does not properly handle an out-of-order LMP Setup procedure that is followed by a malformed LMP packet, allowing attackers in radio range to deadlock a device via a crafted LMP packet. The user needs to manually reboot the device to restore communication.","status":"published","published":"2021-09-07T06:03:47Z","modified":"2024-08-03T23:03:33.593Z","updated_at":"2026-11-02T14:33:05.331617Z"}],"euvd":[{"id":"EUVD-2021-18500","description":"The Bluetooth Classic implementation on Zhuhai Jieli AC690X and AC692X devices does not properly handle an out-of-order LMP Setup procedure that is followed by a malformed LMP packet, allowing attackers in radio range to deadlock a device via a crafted LMP packet. The user needs to manually reboot the device to restore communication.","status":"published","published":"2021-09-07T06:03:47Z","modified":"2024-08-03T23:03:33Z","updated_at":"2026-11-03T03:24:38.423371Z"}],"ghsa":[{"id":"GHSA-grq2-2v86-6ppx","title":"The Bluetooth Classic implementation on Zhuhai Jieli AC690X and AC692X devices does not properly...","description":"The Bluetooth Classic implementation on Zhuhai Jieli AC690X and AC692X devices does not properly handle an out-of-order LMP Setup procedure that is followed by a malformed LMP packet, allowing attackers in radio range to deadlock a device via a crafted LMP packet. The user needs to manually reboot the device to restore communication.","status":"published","published":"2022-05-24T19:13:16Z","modified":"2023-01-30T05:01:54Z","cvss":[{"version":"3.1","score":5.7,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-667"],"updated_at":"2026-11-02T14:46:30.744651Z"}],"nvd":[{"id":"CVE-2021-31611","description":"The Bluetooth Classic implementation on Zhuhai Jieli AC690X and AC692X devices does not properly handle an out-of-order LMP Setup procedure that is followed by a malformed LMP packet, allowing attackers in radio range to deadlock a device via a crafted LMP packet. The user needs to manually reboot the device to restore communication.","status":"published","published":"2021-09-07T07:15:07.043Z","modified":"2026-06-17T03:52:04.72Z","cvss":[{"version":"3.1","score":5.7,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary"},{"version":"2.0","score":3.3,"vector":"AV:A/AC:L/Au:N/C:N/I:N/A:P","level":"low","assessor":"primary"}],"cwes":["CWE-667"],"updated_at":"2026-11-02T14:06:58.05696Z"}]}}