The WZ523 is a wheeled armored personnel carrier of Chinese origin. It was developed in the early 1980's by Norinco to meet the requirements of the Chinese military, which opted for the more capable WZ551 instead. As such only limited quantities of the WZ523 were ever produced. Of the many proposed variants the ZFB91 internal security vehicle was the only one that was adopted.

The WZ523 is based on the 6x6 chassis of the HY472 and LT665 trucks and shares many automotive components. A large steel unibody makes up the body. The driver and commander are seated at the front. The engine and transmission is mounted in the middle between the front and rear wheels. The crew compartment is at the rear and is accessible through a large rear door. Usually a two man turret is fitted.

The original WZ523 was fitted with a simple two man turret with a single 12.7mm Type 54 or QJC88 heavy machine gun. The ZFB91 has a one man turret with a single 7.62mm Type 80 machine gun, 12.7mm QJC88 heavy machine gun or 35mm QLZ-04 automatic grenade launcher.

The steel armor protects against small arms fire and shell splinters. An NBC system is fitted and six smoke grenade dischargers are fitted on the turret sides. It is possible that the wheels do not feature run flat inserts.

The 6x6 chassis allows for a good speed on roads and reasonable off road speeds. Due to the wheelbase the WZ523 has poor performance in harsh cross country scenarios. A 165 hp petrol engine provides propulsion. The maximum road speed is 80 km/h and the maximum road range is 600 km.

The ZFB91 is used in small quantities by the Chinese military and police forces. It has been exported in small numbers to various Asian and African nations.