{"cve":"CVE-2021-31786","nvd":{"published":"2021-09-07T07:15:07.190","modified":"2026-06-17T03:52:14.147","status":"Modified","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.","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":["CWE-667"],"references":["https://dl.packetstormsecurity.net/papers/general/braktooth.pdf","https://launchstudio.bluetooth.com/ListingDetails/76427","https://www.actions-semi.com/index.php?id=3581&siteId=4","https://dl.packetstormsecurity.net/papers/general/braktooth.pdf","https://launchstudio.bluetooth.com/ListingDetails/76427"],"products":["actions-semi:ats2815_firmware","actions-semi:ats2819_firmware","actions-semi:ats2819p_firmware","actions-semi:ats2819s_firmware","actions-semi:ats2819t_firmware"],"source":"nvd","synced_at":"2026-10-19T21:21:57.125947417+00:00"},"epss":{"cve":"CVE-2021-31786","score":0.00443,"percentile":0.38497,"date":"2026-11-01"},"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."]}