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This is essentially a remote crash vunerability in BTU. Most versions of Bitcoin Unlimited(and Classic on a quick check) have this bug. With a crafted XTHIN request, any node running XTHIN can be remotely crashed. If Bitcoin Unlimited was a predominant client, this is a vulnerability that would have left the entire network open to being crashed. Almost all Bitcoin Unlimited nodes live now have this bug.
To be explicitly clear, just by making a request on the peer-to-peer network, this could be used to crash any XTHIN node with this bug. Any business could have been shutdown mid-transaction, an exchange in the middle of a high volume trading period, a miner in the course of operating could be attacked in this manner. The network could have in total been brought down. Major businesses could have been brought grinding to a halt.
How many bugs, screw ups, and irrational arguments do people have to see before they realize how unsafe BTU is? If you run a Bitcoin Unlimited node, shut it down now. If you don't you present a threat to the network.