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

DLA 2537-1: ffmpeg security update

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Debian LTS Advisory DLA-2537-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Roberto C. Sánchez
January 31, 2021   https://wiki.debian.org/LTS
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Package : ffmpeg
Version : 7:3.2.15-0+deb9u2
CVE ID : CVE-2019-17539 CVE-2020-35965
Debian Bug : 979999

Two vulnerabilities have been discovered in ffmpeg, a widely used
multimedia framework.

CVE-2019-17539

a NULL pointer dereference and possibly unspecified other impact
when there is no valid close function pointer

CVE-2020-35965

an out-of-bounds write because of errors in calculations of when to
perform memset zero operations

For Debian 9 stretch, these problems have been fixed in version
7:3.2.15-0+deb9u2.

We recommend that you upgrade your ffmpeg packages.

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

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