Over the past 5 years, we have seen a rise in the number of vulnerabilities in SCADA software.
SCADA software today is at the stage mainstream software was 10 years ago: security updates are erratic (there is great variation in how they are handled), compared to what we are accustomed to in mainstream programs.
Many vulnerabilities remain unpatched for longer than one month in SCADA software.
Read more in the Secunia Vulnerability Review 2014. Download it here.