In the last few months of 2018, Microsoft’s regular security releases included patches for vulnerabilities that were activelybeing exploited. Thankfully, 2019 started off relatively smoothlywith 49 security patches and two advisories — seven of these vulnerabilities were rated Critical and 40 were Important. Ten of these were disclosed through the Zero Day Initiative (ZDI) program.

https://blog.trendmicro.com/trendlabs-security-intelligence/january-patch-tuesday-first-bulletin-of-2019-has-fixes-for-dhcp-and-microsoft-exchange-vulnerabilities/