An atftp security update has been released for Debian GUN/Linux 9 LTS.

DLA 2820-1: atftp security update

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Debian LTS Advisory DLA-2820-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Thorsten Alteholz
November 17, 2021   https://wiki.debian.org/LTS
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Package : atftp
Version : 0.7.git20120829-3.1~deb9u2
CVE ID : CVE-2020-6097 CVE-2021-41054

Two issues have been found in atftp, an advanced TFTP client.
Both are related to sending crafted requests to the server and triggering
a denial-of-service due to for example a buffer overflow.

For Debian 9 stretch, these problems have been fixed in version
0.7.git20120829-3.1~deb9u2.

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