Some months ago a serious vulnerability on EXIM has been disclosed (CVE-2017-16943), and in the last hours Meh Chang (from devco.re) discovered a buffer overflow that allows remote command execution on this MTA.
Cisco released security updates to address a critical security vulnerability in Cisco ASA software.
Pavel Boldin published a new PoC exploit of Meltdown vulnerability working on Linux, written in C.
In-Spectre-Meltdown is a PoC developed by Viral Maniar using Python and Powershell to check speculative execution side-channel attacks that affect many modern processors and operating systems designs that allows unprivileged processes to steal secrets from privileged processes.
In the last hours, the vulnerabilities of the CPU have had a great prominence even in the non-specialized press. So, I think that would be useful trying to summarize the situation in a simple way.