of a major software vulnerability flagged by microsoft and federal officials including the homeland security secretary today. what did he have to say? >> he says, jake, he is extraordinarily concerned and that echoes what we've heard from a range of officials and cyber security experts the head of the main cyber agency says this is the most serious flaw that she has ever seen. what is this flaw? it is in a software called log4j which the vast majority of our viewers will not have heard of but it is used extensively across the internet by companies that everybody has heard of. apple, microsoft, ibm. >> so is this in my phone? i have an iphone. >> it could get to that point. it is in the very popular game minecraft which so many people play. what is very scary is not just the prevalence but how easy it is to exploit. it is not even basic hackers who can use this. the sophisticated hackers are the ones doing the most damage. it means they could get into