There are some very clear explanations on the issue. One of these can be found here:
If you'd rather watch a video on it: http://www.ibtimes.coyoutube.ukcom/what-poodle-latest-online-security-threat-after-shellshock-heartbleed-1470300watch?v=C8ks8WLoZto
If you'd prefer to read about it: http://www.ibtimes.co.uk/what-poodle-latest-online-security-threat-after-shellshock-heartbleed-1470300