Memory leak in Huawei IPS Module, NGFW Module, NIP6300, NIP6600, and Secospace USG6300, USG6500, USG6600, USG9500, and AntiDDoS8000 V500R001C00 before V500R001C20SPC100, when in hot standby networking where two devices are not directly connected, allows remote attackers to cause a denial of service (memory consumption and reboot) via a crafted packet.