Remote Code Execution - Shell Shock

This vulnerability allows the attacker to remotely execute bash commands from environment variables on the server, i.e. Remote Code Execution. Although Bash is not an internet-facing service many other services use environment variables to communicate with the server so the severity of the attack depends on the server configuration. This vulnerability can lead to replacement of vital server resources and take over of the system.

Update Bash on your server to the version 4.3 or above.

ScanRepeat sends a HTTP request to the host server which contains a prepared char sequence with the command to delay the response. It reports every occurence of vulnerability, which executed the bash command and delayed the response.