CVE-2026-1638: Tenda AC21 Firmware

High severity, CVSS 8.8. EPSS: 2.2% chance of exploitation in the next 30 days.

A security flaw has been discovered in Tenda AC21 1.1.1.1/1.dmzip/16.03.08.16. The impacted element is the function mDMZSetCfg of the file /goform/mDMZSetCfg. The manipulation of the argument dmzIp results in command injection. The attack can be executed remotely. The exploit has been released to the public and may be used for attacks.

Affected products

• Tenda AC21 Firmware: version 16.03.08.16 only

Published 2026-01-30. Last modified 2026-06-17.