While it might not be the worst case scenario, a security breach at the Canada Revenue Agency could be the worst known real-world exploit of the Heartbleed vulnerability since it went global last week. The CRA claims that almost 1,000 Social Insurance Numbers, as well as unspecified business data was removed from the CRA systems by hackers using the high profile server vulnerability. Most significantly, the breach happened after the CRA (and the world) learned about Heartbleed.