2018 started with news affecting computers everywhere.
Security researchers discovered the flaws late in 2017 and publicized them in early 2018.
These security vulnerabilities are known as Meltdown and Spectre. These vulnerabilities exist at the hardware level.
There is no evidence that these vulnerabilities have ever been exploited in the wild.
For detailed discussions on what these security vulnerabilities entail, please see the following Wikipedia pages:
Asof 23 January 2018 all MrBackup servers have been patched and secured.