CVE-2026-2870: Tenda a21 Firmware

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

A security flaw has been discovered in Tenda A21 1.0.0.0. Affected by this issue is the function set_qosMib_list of the file /goform/formSetQosBand. The manipulation of the argument list results in stack-based buffer overflow. The attack can be executed remotely. The exploit has been released to the public and may be used for attacks.

Affected products

• Tenda a21 Firmware: version 1.0.0.0 only

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