CVE-2021-45989: Tendacn g1 Firmware

High severity, CVSS 7.5. EPSS: 1.1% chance of exploitation in the next 30 days.

Tenda routers G1 and G3 v15.11.0.17(9502)_CN were discovered to contain a stack overflow in the function guestWifiRuleRefresh. This vulnerability allows attackers to cause a Denial of Service (DoS) via the qosGuestUpstream and qosGuestDownstream parameters.

Affected products

• Tendacn g1 Firmware: version 15.11.0.17(9502)_cn only
• Tendacn g3 Firmware: version 15.11.0.17(9502)_cn only

Published 2022-02-04. Last modified 2026-06-17.