I am using Ossim and I did a scan vulnerabilities with OpenVas. I received feedback that some of our softwares broke after the scan. We will check the logs to see if the scan cause this, but I was wondering: is OpenVas an active scanner? What are the risks associate with a tool like that?
With the default Configuration OpenVAS will scan actively. It happend to me sometimes in the past that software crashed while scanning it with a vulnerablity scanner. In my expience this applies mostly to badly written PHP apps, IoT devices and cheap routers but of cause it can happen with other targets too.