2018 started with a scenario hardly anyone could have foreseen. Two serious design vulnerabilities in CPUs were exposed that make it possible, although not always that easy, to steal sensitive, private information such as passwords, photos, perhaps even cryptography certificates.
If you are new to the subject you can read about the “Meltdown and Spectre CPU Vulnerabilities here:
https://www.welivesecurity.com/2018/01/05/meltdown-spectre-cpu-vulnerabilities/