I-O DATA DEVICE WN-G54/R2 routers with firmware before 1.03 and NP-BBRS routers allow remote attackers to cause a denial of service (SSDP reflection) via UPnP requests.
http://www.securityfocus.com/bid/76393
http://www.iodata.jp/support/information/2015/wn-g54r2/