https://www.theregister.co.uk/2018/07/26/netspectre_network_leak/

Computer researchers at the University of Graz have devised a way to exploit the speculative execution flaws affecting modern computer chips over a network connection, a possibility that sounds rather more serious but may be something less than that.

"We show that Spectre attacks do not require local code execution but can also be mounted remotely," said Michael Schwartz, one of the researchers involved, in an email to The Register. "Moreover, with the new covert channel, we show that Spectre does not necessarily require the cache to leak values."