LabVIEW Web Server 5.1.1 through 6.1 allows remote attackers to cause a denial of service (crash) via an HTTP GET request that ends in two newline characters, instead of the expected carriage return/newline combinations.
http://www.iss.net/security_center/static/8919.php
http://digital.ni.com/public.nsf/websearch/4C3F86E655E5389886256BA00064B22F?OpenDocument