source: https://www.securityfocus.com/bid/8930/info

It has been reported that E107 may be prone to a denial of service vulnerability. The issue has been reported to exist due to improper handling of user-supplied data in the form of HTML or script code to the 'Name:' field of Chatbox.php script. This issue may cause the software to behave in an unstable manner leading to a crash.

Successful exploitation of this issue may allow an attacker to cause the software to crash or hang.

It should be noted that although this vulnerability has been reported to affect E107 versions 0.545 and 0.603, other versions might also be affected. 

In the Name inputbox of the Chatbox type:

<script = javascript> alert('DoS') <script>