Heartbleed bug: What you need to know

The bug could be a huge problem

This week it has emerged that a major security flaw at the heart of the internet may have been exposing users' personal information and passwords to hackers for the past two years.

It is not known how widely the bug has been exploited, if at all, but what is clear is that it is one of the biggest security issues to have faced the internet to date.

Security expert Bruce Schneier described it as "catastrophic". He said: "On the scale of one to 10, this is an 11."

The BBC has attempted to round up everything you need to know about Heartbleed.

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