security.c in hcid for BlueZ 2.16, 2.17, and 2.18 allows remote attackers to execute arbitrary commands via shell metacharacters in the Bluetooth device name when invoking the PIN helper.

Buffer overflow in l2cap.c in hcidump 1.29 allows remote attackers to cause a denial of service (crash) through a wireless Bluetooth connection via a malformed Logical Link Control and Adaptation Protocol (L2CAP) packet.

In BlueZ 5.42, an out-of-bounds read was identified in "packet_hexdump" function in "monitor/packet.c" source file. This issue can be triggered by processing a corrupted dump file and will result in btmon crash.