The remote host may give an attacker information useful for future attacks.
The remote host is running a version of PHP that is older than 5.0.2. This version has a bug that allows an attacker to insert an arbitrary value into an array. When the PHP parser handles the array, it may leak memory information back to the web client. A successful attacker would be able to retrieve information from the server that is potentially confidential in nature.
Upgrade to PHP 5.0.2 or higher.