Today's highly-scalable low-latency Web services rely on in-memory key-value stores. While they are essential to improve Web service performance they should not be exposed to the Internet. Security problems range from data leakage to remote code execution. In this paper we use a year long data set of exposed Redis and memcached instances to highlight the magnitude (about 200K) of the problem, document new transitive attacks, and explore misconfiguration patterns. We find that the number of exposed instances is constantly on the rise and that even severe problems only lead to temporal decreases. However, by correlating misconfiguration patterns we can explain significant changes in the number of exposed systems.