Cyber attacks have become one of the most worrisome risks considered chief financial officers (CFOs), according to Deloitte’s quarterly CFO Signalssurvey. The rate of CFOs citing cyber attacks as a key concern has risen sharply over the survey’s four-year history, directly correlating to both the frequency and cost of cyber attacks. According to the Ponemon Institute, the average cost for a data breach is now $3.6 million globally – a 15 percent increase from last year. (It’s considerably higher for U.S. companies – $5.85 million.)

Whether you are a CFO, or merely report to one, here are five realities that your financial executive needs to understand about cybersecurity, according to Deloitte: