Zeroshell 3.9.0 is prone to a remote command execution vulnerability. Specifically, this issue occurs because the web application mishandles a few HTTP parameters. An unauthenticated attacker can exploit this issue by injecting OS commands inside the vulnerable parameters.
View the template here CVE-2019-12725.yaml
References:
https://nvd.nist.gov/vuln/detail/CVE-2019-12725