Espressif ESP-IDF 2.x 3.0.x through 3.0.9 3.1.x through 3.1.7 3.2.x through 3.2.3 3.3.x through 3.3.2 and 4.0.x through 4.0.1 has a Buffer Overflow in BluFi provisioning in btc_blufi_recv_handler function in blufi_prf.c. An attacker can send a crafted BluFi protocol Write Attribute command to characteristic 0xFF01. With manipulated packet fields there is a buffer overflow.