NUUO NVRmini2 devices contain a missing authentication vulnerability that allows an unauthenticated attacker to upload an encrypted TAR archive, which can be abused to add arbitrary users.
The impacted product is end-of-life (EoL) and/or end-of-service (EoS). Users should discontinue utilization of the product.
CWE-306
https://nuuo.com/wp-content/uploads/2023/03/NUUO-EOL-letter＿NVRmini-2-and-NVRsolo-series.pdf