A tcpdump security update has been released for Debian GNU/Linux 9 LTS to address an issue with the buffer size.

DLA 2444-1: tcpdump security update

- -----------------------------------------------------------------------
Debian LTS Advisory DLA-2444-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Utkarsh Gupta
November 10, 2020   https://wiki.debian.org/LTS
- -----------------------------------------------------------------------

Package : tcpdump
Version : 4.9.3-1~deb9u2
CVE ID : CVE-2020-8037
Debian Bug : 973877

The ppp de-capsulator in tcpdump 4.9.3 can be convinced to allocate
a large amount of memory.

The buffer should be big enough to hold the captured data, but it
doesn’t need to be big enough to hold the entire on-the-network
packet, if we haven’t captured all of it.

For Debian 9 stretch, this problem has been fixed in version
4.9.3-1~deb9u2.

We recommend that you upgrade your tcpdump packages.

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

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