The boot loaders in Honor 5A smart phones with software Versions earlier than CAM-TL00C01B193,Versions earlier than CAM-TL00HC00B193,Versions earlier than CAM-UL00C00B193 have a buffer overflow vulnerability. An attacker with the root privilege of an Android system may trick a user into installing a malicious APP. The APP can modify specific data to cause buffer overflow in the next system reboot, causing continuous system reboot or arbitrary code execution.