A weakness named NetCAT (Network Cache ATtack) affects all Intel server-grade processors since 2012 and allows sniffing sensitive details by mounting a side-channel attack over the network. Intel acknowledged the issue, which is tracked as CVE-2019-11184, and awarded a bounty for the disclosure and the technical details. Intel recommends strong security controls on a secured network where Intel DDIO and RDMA (Remote Direct Memory Access) are enabled. Despite this warning, the vulnerability has a low severity score of just 2.6 out of 10.
Source: https://www.bleepingcomputer.com/news/security/new-netcat-attack-can-leak-sensitive-data-from-intel-cpus/