{"cve":"CVE-2021-31612","nvd":{"published":"2021-09-07T07:15:07.093","modified":"2026-06-17T03:52:04.840","status":"Modified","description":"The Bluetooth Classic implementation on Zhuhai Jieli AC690X devices does not properly handle the reception of an oversized LMP packet greater than 17 bytes during the LMP auto rate procedure, allowing attackers in radio range to trigger a deadlock via a crafted LMP packet.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":6.5},"cwes":[],"references":["http://www.zh-jieli.com/product/68-cn.html","https://dl.packetstormsecurity.net/papers/general/braktooth.pdf","https://launchstudio.bluetooth.com/ListingDetails/19746","http://www.zh-jieli.com/product/68-cn.html","https://dl.packetstormsecurity.net/papers/general/braktooth.pdf"],"products":["zh-jieli:ac6901_firmware","zh-jieli:ac6902_firmware","zh-jieli:ac6903_firmware","zh-jieli:ac6904_firmware","zh-jieli:ac6905_firmware","zh-jieli:ac6907_firmware","zh-jieli:ac6908_firmware","zh-jieli:ac690n_firmware","zh-jieli:ac692n_firmware","zh-jieli:ac6997_firmware","zh-jieli:ac6998_firmware","zh-jieli:ac6999_firmware"],"source":"nvd","synced_at":"2026-10-19T21:21:57.125947417+00:00"},"epss":{"cve":"CVE-2021-31612","score":0.00531,"percentile":0.44931,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}