An exploitable OS Command Injection vulnerability exists in the Telnet, SSH, and console login functionality of Moxa AWK-3131A Industrial IEEE 802.11a/b/g/n wireless AP/bridge/client in firmware versions 1.4 to 1.7 (current). An attacker can inject commands via the username parameter of several services (SSH, Telnet, console), resulting in remote, unauthenticated, root-level operating system command execution.