The firewall module on the Huawei Quidway Service Process Unit (SPU) board S7700, S9300, and S9700 on Huawei Campus Switch devices allows remote authenticated users to obtain sensitive information from the high-priority security zone by leveraging access to the low-priority security zone.

Huawei Quidway S9700 V200R003C00SPC500, Quidway S9300 V200R003C00SPC500, Quidway S7700 V200R003C00SPC500, Quidway S6700 V200R003C00SPC300, Quidway S6300 V200R003C00SPC300, Quidway S5700 V200R003C00SPC300, Quidway S5300 V200R003C00SPC300 enable attackers to launch DoS attacks by crafting and sending malformed packets to these vulnerable products.