A edk2 security update has been released for Debian GNU/Linux 9 LTS to address several security vulnerabilities.

DLA 2645-1: edk2 security update

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Debian LTS Advisory DLA-2645-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Markus Koschany
April 29, 2021   https://wiki.debian.org/LTS
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Package : edk2
Version : 0~20161202.7bbe0b3e-1+deb9u2
CVE ID : CVE-2019-0161 CVE-2019-14558 CVE-2019-14559 CVE-2019-14562
CVE-2019-14563 CVE-2019-14575 CVE-2019-14584 CVE-2019-14586
CVE-2019-14587 CVE-2021-28210 CVE-2021-28211
Debian Bug : 952926 968819 952934 977300

Several security vulnerabilities have been discovered in edk2, firmware for
virtual machines. Integer and stack overflows and uncontrolled resource
consumption may lead to a denial-of-service or in a worst case scenario,
allow an authenticated local user to potentially enable escalation of
privilege.

For Debian 9 stretch, these problems have been fixed in version
0~20161202.7bbe0b3e-1+deb9u2.

We recommend that you upgrade your edk2 packages.

For the detailed security status of edk2 please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/edk2

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