A slirp security update has been released for Debian GNU/Linux 9 LTS to address two issues.

DLA 2551-1: slirp security update

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Debian LTS Advisory DLA-2551-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Thorsten Alteholz
February 09, 2021   https://wiki.debian.org/LTS
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Package : slirp
Version : 1:1.0.17-8+deb9u1
CVE ID : CVE-2020-7039 CVE-2020-8608

Two issues have been found in slirp, a SLIP/PPP emulator using a dial up
shell account.

CVE-2020-7039

Due to mismanagement of memory, a heap-based buffer overflow or
other out-of-bounds access might happen, which can lead to a DoS
or potential execute arbitrary code.

CVE-2020-8608

Prevent a buffer overflow vulnerability due to incorrect usage
of return values from snprintf.

For Debian 9 stretch, these problems have been fixed in version
1:1.0.17-8+deb9u1.

We recommend that you upgrade your slirp packages.

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

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