NXP LPC55S66JBD64 LPC55S66JBD100 LPC55S66JEV98 LPC55S69JBD64 LPC55S69JBD100 and LPC55S69JEV98 microcontrollers (ROM version 1B) have a buffer overflow in parsing SB2 updates before the signature is verified. This can allow an attacker to achieve non-persistent code execution via a crafted unsigned update.