CVE:CVE-2020-9500
CNNVD:CNNVD-202004-554
Dahua SD6AL Series等都是中国大华（Dahua）公司的产品。SD6AL Series是一款SD6AL系列网络摄像机。NVR 5x Series是一款5x系列的网络视频录像机。IPC-HX2XXX Series是一款IPC-HX2XXX系列网络摄像机。
多款Dahua产品中存在安全漏洞。攻击者可借助日志查询命令利用该漏洞造成拒绝服务。以下产品及版本受到影响：Dahua SD 6AL Series；SD 5A Series；SD 1A Series；SD 50/52C Series；NVR N5x Series；NVR N4x Series；IPC N4 Series。
solution:Upgrade dahuasecurity sd6al_firmware to a higher version than 2019-12,and avoid the version (,2019-12); Upgrade dahuasecurity sd5a_firmware to a higher version than 2019-12,and avoid the version (,2019-12); Upgrade dahuasecurity sd1a_firmware to a higher version than 2019-12,and avoid the version (,2019-12); Upgrade dahuasecurity ptz1a_firmware to a higher version than 2019-12,and avoid the version (,2019-12); Upgrade dahuasecurity sd50_firmware to a higher version than 2019-12,and avoid the version (,2019-12); Upgrade dahuasecurity sd52c_firmware to a higher version than 2019-12,and avoid the version (,2019-12); Upgrade dahuasecurity ipc-hx5842h_firmware to a higher version than 2019-12,and avoid the version (,2019-12); Upgrade dahuasecurity ipc-hx7842h_firmware to a higher version than 2019-12,and avoid the version (,2019-12); Upgrade dahuasecurity ipc-hx2xxx_firmware to a higher version than 2019-12,and avoid the version (,2019-12); Upgrade dahuasecurity ipc-hxxx5x4x_firmware to a higher version than 2019-12,and avoid the version (,2019-12); Upgrade dahuasecurity n42b1p_firmware to a higher version than 2019-12,and avoid the version (,2019-12); Upgrade dahuasecurity n42b2p_firmware to a higher version than 2019-12,and avoid the version (,2019-12); Upgrade dahuasecurity n42b3p_firmware to a higher version than 2019-12,and avoid the version (,2019-12); Upgrade dahuasecurity n52a4p_firmware to a higher version than 2019-12,and avoid the version (,2019-12); Upgrade dahuasecurity n54a4p_firmware to a higher version than 2019-12,and avoid the version (,2019-12); Upgrade dahuasecurity n52b2p_firmware to a higher version than 2019-12,and avoid the version (,2019-12); Upgrade dahuasecurity n52b5p_firmware to a higher version than 2019-12,and avoid the version (,2019-12); Upgrade dahuasecurity n52b3p_firmware to a higher version than 2019-12,and avoid the version (,2019-12); Upgrade dahuasecurity n54b2p_firmware to a higher version than 2019-12,and avoid the version (,2019-12)