A libntlm security update has been for Debian GNU/Linux 9 LTS.

DLA 2831-1: libntlm security update

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Debian LTS Advisory DLA-2831-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Adrian Bunk
November 28, 2021   https://wiki.debian.org/LTS
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Package : libntlm
Version : 1.4-8+deb9u1
CVE ID : CVE-2019-17455
Debian Bug : 942145

Stack-based buffer over-reads for crafted NTLM requests were fixed in
libntlm, a library that implements Microsoft's NTLM authentication.

For Debian 9 stretch, this problem has been fixed in version
1.4-8+deb9u1.

We recommend that you upgrade your libntlm packages.

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

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