Linksys E1000 devices through 2.1.02, E1200 devices before 2.0.05, and E3200 devices through 1.0.04 allow OS command injection via shell metacharacters in the apply.cgi pingip parameter on TCP port 52000.
There is stack-based buffer overflow vulnerability in pcchangeact function in Linksys E1000 router firmware version v.2.1.03 and before, leading to remote code execution.