CVE-2021-31612: Zh-Jieli AC6901 Firmware

Medium severity, CVSS 6.5. EPSS: 0.5% chance of exploitation in the next 30 days.

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.

Affected products

• Zh-Jieli AC6901 Firmware: affected versions not specified
• Zh-Jieli AC6902 Firmware: affected versions not specified
• Zh-Jieli AC6903 Firmware: affected versions not specified
• Zh-Jieli AC6904 Firmware: affected versions not specified
• Zh-Jieli AC6905 Firmware: affected versions not specified
• Zh-Jieli AC6907 Firmware: affected versions not specified
• Zh-Jieli AC6908 Firmware: affected versions not specified
• Zh-Jieli AC690N Firmware: affected versions not specified
• Zh-Jieli AC692N Firmware: affected versions not specified
• Zh-Jieli AC6997 Firmware: affected versions not specified
• Zh-Jieli AC6998 Firmware: affected versions not specified
• Zh-Jieli AC6999 Firmware: affected versions not specified

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