A microcode_ctl security update has been been released for CentOS 7.

CentOS-announce: CESA-2020:5083 Moderate CentOS 7 microcode_ctl Security Update

CentOS Errata and Security Advisory 2020:5083 Moderate

Upstream details at :   https://access.redhat.com/errata/RHSA-2020:5083

The following updated files have been uploaded and are currently
syncing to the mirrors: ( sha256sum Filename )

x86_64:
09b0a412ef431cf5907e6d41f5bf960d051927c73b0a292dea9a52585f306e01 microcode_ctl-2.1-73.2.el7_9.x86_64.rpm

Source:
d7e8ae266d767b1645e22f0b18f229df0ef8289c742b7b3e7b434047a1270a7c microcode_ctl-2.1-73.2.el7_9.src.rpm