83 percent of the Top 30 U.S. retailers have vulnerabilities which pose an imminent cyber-threat, including Amazon, Costco, Kroger and Walmart. Industrial firms face various challenges, with some needing to shut down entire factories in order to apply updates. As just one symptom of the problem is that some companies have to close entire factories to patch-up their critical flaws, such as Amazon and Costco, to avoid cyber-security breaches. Some companies have even been forced to close their entire factories after patching critical flaws.
Source: https://threatpost.com/adobe-patches-flash-new-flaw-reader-021210/73533/