A microcode_ctl security update has been released for CentOS 7.

CESA-2021:3028 Important CentOS 7 microcode_ctl Security Update

CentOS Errata and Security Advisory 2021:3028 Important

Upstream details at :   https://access.redhat.com/errata/RHSA-2021:3028

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

x86_64:
68b647f3d90f5828c04a513b4561ba0866363b42452fbf73668418e2faa06983 microcode_ctl-2.1-73.11.el7_9.x86_64.rpm

Source:
e53891c0f92e021a87e8bda5e3ec6b66e6b05ca2c4eed2267de314c906cc7623 microcode_ctl-2.1-73.11.el7_9.src.rpm