400
Never-before-seen Linux malware gets installed using 1-day exploits
(arstechnica.com)
This is a most excellent place for technology news and articles.
Actually, that's pretty much it. According to the article, it attacks a specific piece of ecommerce software (Magento), and I get the impression the attack isn't viable if the software has all the latest fixes. So it's dangerous only to a subset of servers.