How to test shellshock against remote machine using a simple script

I am interested in testing for shellshock vulnerable machines that I don't have shell access to on my LAN's and WAN's such as IPMI cards and Internet of Things devices. What is the best way to remotely verify the vulnerability on machines? Does anybody have a simple shell script that can be run? I want to avoid using any websites that do this test as they may actually take advantage of the information gained by running the tests on vulnerable machines.