On Patlite NH-FB series devices through 1.46, remote attackers can cause a denial of service by omitting the query string. NOTE: the vendor's perspective is that "omitting the query string does not cause a denial of service and the indicated event can not be reproduced.
https://www.patlite.com/network-products/lineup/nh-fb.html
https://www.patlite.co.jp/product/detail0000021462.html
https://packetstormsecurity.com/files/167797/Patlite-1.46-Buffer-Overflow.html