Ac9 Firmware Security Vulnerabilities - February 2022

CVE-2020-26728

A vulnerability was discovered in Tenda AC9 v3.0 V15.03.06.42_multi and Tenda AC9 V1.0 V15.03.05.19(6318)_CN which allows for remote code execution via shell metacharacters in the guestuser field to the __fastcall function with a POST request.

CVE-2022-25414

Tenda AC9 V15.03.2.21_cn was discovered to contain a stack overflow via the parameter NPTR.

CVE-2022-25417

Tenda AC9 V15.03.2.21_cn was discovered to contain a stack overflow via the function saveparentcontrolinfo.

CVE-2022-25418

Tenda AC9 V15.03.2.21_cn was discovered to contain a stack overflow via the function openSchedWifi.