CVE-2021-40546: Tenda AC6 Firmware

Medium severity, CVSS 4.9. EPSS: 0.7% chance of exploitation in the next 30 days.

Tenda AC6 US_AC6V4.0RTL_V02.03.01.26_cn.bin allows attackers (who have the administrator password) to cause a denial of service (device crash) via a long string in the wifiPwd_5G parameter to /goform/setWifi.

Affected products

• Tenda AC6 Firmware: version 02.03.01.26 only

Published 2023-09-05. Last modified 2026-06-17.