source: https://www.securityfocus.com/bid/2392/info

It is possible for a remote user to cause a denial of service condition in Working Resources BadBlue.

Requesting a specially crafted URL composed of 284 or more bytes, will cause the server to crash.

A restart of the server is required in order to gain normal functionality. 

http://target/ext.dll?aaaaa(x 248 bytes)