An amd64-microcode update has been released for Debian GNU/Linux 9 LTS to address CVE-2017-5715.

DLA 2743-2: amd64-microcode update

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Debian LTS Advisory DLA-2743-2 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Utkarsh Gupta
October 18, 2021   https://wiki.debian.org/LTS
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Package : amd64-microcode
Version : 3.20181128.1~deb9u2

DLA-2743-1 was issued for CVE-2017-5715, affecting amd64-microcode,
processor microcode firmware for AMD CPUs. However, the binaries for
the resulting upload weren't built and published, thereby preventing
the users to upgrade to a fixed version.

For Debian 9 stretch, this problem has been fixed in version
3.20181128.1~deb9u2.

We recommend that you upgrade your amd64-microcode packages.

For the detailed security status of amd64-microcode please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/amd64-microcode

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://wiki.debian.org/LTS