An issue in TOTOLINK-CX-A3002RU V1.0.4-B20171106.1512 and TOTOLINK-CX-N150RT V2.1.6-B20171121.1002 and TOTOLINK-CX-N300RT V2.1.6-B20170724.1420 and TOTOLINK-CX-N300RT V2.1.8-B20171113.1408 and TOTOLINK-CX-N300RT V2.1.8-B20191010.1107 and TOTOLINK-CX-N302RE V2.0.2-B20170511.1523 allows a remote attacker to execute arbitrary code via the /boafrm/formSysCmd component.

On certain TOTOLINK Realtek SDK based routers, an authenticated attacker may execute arbitrary OS commands via the sysCmd parameter to the boafrm/formSysCmd URI, even if the GUI (syscmd.htm) is not available. This allows for full control over the device's internals. This affects A3002RU through 2.0.0, A702R through 2.1.3, N301RT through 2.1.6, N302R through 3.4.0, N300RT through 3.4.0, N200RE through 4.0.0, N150RT through 3.4.0, N100RE through 3.4.0, and N302RE 2.0.2.