The SNMPc Server (crserv.exe) process in Castle Rock Computing SNMPc before 7.0.19 allows remote attackers to cause a denial of service (crash) via a crafted packet to port 165/TCP.
SNMPc 6.0.8 and earlier performs authentication to the server on the client side, which allows remote attackers to gain privileges by decrypting the password that is returned by the server.