The Open Connectivity Foundation UPnP specification before 2020-04-17 does not forbid the acceptance of a subscription request with a delivery URL on a different network segment than the fully qualified event-subscription URL, aka the CallStranger issue.

There is a Clickjacking vulnerability in Huawei HG255s product. An attacker may trick user to click a link and affect the integrity of a device by exploiting this vulnerability.

Huawei HG255s-10 V100R001C163B025SP02 has a path traversal vulnerability due to insufficient validation of the received HTTP requests, a remote attacker may access the local files on the device without authentication.