CVE-2026-2886: Tenda a21 Firmware

High severity, CVSS 8.8. EPSS: 1% chance of exploitation in the next 30 days.

A weakness has been identified in Tenda A21 1.0.0.0. This affects the function set_device_name of the file /goform/SetOnlineDevName. This manipulation of the argument devName causes stack-based buffer overflow. It is possible to initiate the attack remotely. The exploit has been made available to the public and could be used for attacks.

Affected products

• Tenda a21 Firmware: version 1.0.0.0 only

Published 2026-02-21. Last modified 2026-06-17.