Embedded systems still use archaic methods.
"We just lived through the nightmare scenario we were worried about as we called for a moratorium on The DAO: someone exploited a weakness in the code of The DAO to empty out more than 2M ($40M USD) ether.
The exploit seems to have targeted the reentrancy problem in the 'splitDAO' function..."
http://hackingdistributed.com/2016/06/17/thoughts-on-the-dao-hack/
"We just lived through the nightmare scenario we were worried about as we called for a moratorium on The DAO: someone exploited a weakness in the code of The DAO to empty out more than 2M ($40M USD) ether.
The exploit seems to have targeted the reentrancy problem in the 'splitDAO' function..."
http://hackingdistributed.com/2016/06/17/thoughts-on-the-dao-hack/