The web interface in Samsung DVR SHR2040 allows remote attackers to cause a denial of service (crash) via a malformed HTTP request, related to the filter for configuration properties and "/x" characters.
https://www.exploit-db.com/exploits/6394
https://exchange.xforce.ibmcloud.com/vulnerabilities/44995
http://www.sybsecurity.com/advisors/SYBSEC-ADV16-Samsung_DVR_SHR_2040_HTTPD_Remote_Denial_Of_Service