A docker.io security update has been released for Debian GNU/Linux 10 to address multiple security issues.

DSA 4865-1: docker.io security update

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Debian Security Advisory DSA-4865-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
February 27, 2021   https://www.debian.org/security/faq
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Package : docker.io
CVE ID : CVE-2020-15157 CVE-2020-15257 CVE-2021-21284 CVE-2021-21285

Multiple security issues were discovered in Docker, a Linux container
runtime, which could result in denial of service, an information leak
or privilege escalation.

For the stable distribution (buster), these problems have been fixed in
version 18.09.1+dfsg1-7.1+deb10u3.

We recommend that you upgrade your docker.io packages.

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

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