An analysis of security threats in 2012 conducted by managed security services provider Solutionary found dozens of common costly security weaknesses plaguing large and small organizations. DDoS attacks can cost a firm more than $6,000 an hour, said Don Gray, chief security strategist of the Pittsburgh-based firm. Malware infections can cost $3,000 a day, Gray said. Having the right controls in place and being able to appropriately execute a response plan can help control the costs, he said.

Here's a look at five of the most common security threats Solutionary found, as well as advice on how to reduce security costs.