What is a CCM_POST HTTP Request?

I keep getting error messages like these on a server running an installation of an embedded Mongoose webserver

[1280931978] [error] [client 66.65.74.105] CCM_POST /ccm_system/request: Error 400: Bad Request[1280931558] [error] [client 71.162.141.214] CCM_POST /ccm_system/request: Error 400: Bad Request

I figured out that CCM_POST seems to be some kind of HTTP command LIKE GET, POST, PUT and DELETE, but what is it supposed to do?

Is that some kind of vulnerability scan?