Salesforce has recently posted a Security Advisory as it relates to Spectre/Meltdown Vulnerabilities.


The Salesforce Security team continuously monitors their systems for any evidence of attempts to exploit vulnerabilities such as 'Spectre' and 'Meltdown'.  At this time, they have seen no indications of attempts to target Salesforce systems using these vulnerabilities.


Details can be found here:


The above can also be reached through Salesforce Trust: Security Advisories