A libupnp security update has been released for Debian GNU/Linux 9 LTS to address a denial of service issue.

DLA 2585-1: libupnp security update

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Debian LTS Advisory DLA-2585-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Utkarsh Gupta
March 08, 2021   https://wiki.debian.org/LTS
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Package : libupnp
Version : 1:1.6.19+git20160116-1.2+deb9u1
CVE ID : CVE-2020-13848
Debian Bug : 962282

libupnp, the portable SDK for UPnP Devices allows remote attackers to
cause a denial of service (crash) via a crafted SSDP message due to a
NULL pointer dereference in the functions FindServiceControlURLPath
and FindServiceEventURLPath in genlib/service_table/service_table.c.

For Debian 9 stretch, this problem has been fixed in version
1:1.6.19+git20160116-1.2+deb9u1.

We recommend that you upgrade your libupnp packages.

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

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