An atftp security update has been released for Debian GNU/Linux 9 LTS to address missing bound checks.

DLA 3028-1: atftp security update

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Debian LTS Advisory DLA-3028-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Thorsten Alteholz
May 27, 2022   https://wiki.debian.org/LTS
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Package : atftp
Version : 0.7.git20120829-3.1~deb9u3
CVE ID : CVE-2021-46671

An issue has been found in package atftp, an advanced TFTP client/server.

Due to missing bound checks, data could be read behind a buffer so that
sensible information might be disclosed to a remote client.

For Debian 9 stretch, this problem has been fixed in version
0.7.git20120829-3.1~deb9u3.

We recommend that you upgrade your atftp packages.

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

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