Some Dahua products have the problem of denial of service during the login process. An attacker can cause a device crashed by constructing a malicious packet. Affected products include: IPC-HDW1X2X IPC-HFW1X2X IPC-HDW2X2X IPC-HFW2X2X IPC-HDW4X2X IPC-HFW4X2X IPC-HDBW4X2X IPC-HDW5X2X IPC-HFW5X2X for versions which Build time is before August 18 2019.