CVE-2021-34144: Zh-Jieli Fw-AC63 Bt SDK

Medium severity, CVSS 6.5. EPSS: 0.7% chance of exploitation in the next 30 days.

The Bluetooth Classic implementation in the Zhuhai Jieli AC6366C BT SDK through 0.9.1 does not properly handle the reception of truncated LMP_SCO_Link_Request packets while no other BT connections are active, allowing attackers in radio range to prevent new BT connections (disabling the AB5301A inquiry and page scan procedures) via a crafted LMP packet. The user needs to manually perform a power cycle (restart) of the device to restore BT connectivity.

Affected products

• Zh-Jieli Fw-AC63 Bt SDK: up to and including 0.9.1

Published 2021-09-07. Last modified 2026-06-17.