Tenda firmware across multiple versions harbors hidden authentication backdoor

Tenda has released multiple firmware versions for its networking devices. Security researchers have identified a hidden authentication backdoor in those firmware releases. The backdoor can be used to bypass normal login procedures. It affects several Tenda product models that run the affected firmware. The vulnerability is documented in the CERT Vulnerability Database under ID 213560. Exploiting the backdoor could allow attackers to gain unauthorized control of the device. The presence of the backdoor raises concerns about device security and network integrity. Administrators should monitor for signs of unauthorized access and apply updates if available.