Hikvision have today publicly declared a vulnerability with some NVR models and released new firmware to fix the issue.
A detailed statement can be found here:
Security Vulnerabilities in Hikvision NVR Devices
Affected NVR Model & Firmware Versions:
DS-7604NXI-K1/4P - V4.76.005 build231012 and the versions prior to it
A detailed statement can be found here:
Security Vulnerabilities in Hikvision NVR Devices
Affected NVR Model & Firmware Versions:
DS-7604NXI-K1/4P - V4.76.005 build231012 and the versions prior to it