An exim4 security update has been released for Debian GNU/Linux 9 LTS to address several vulnerabilities, which could result in local privilege escalation and remote code execution.

DLA 2650-1: exim4 security update

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Debian LTS Advisory DLA-2650-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Thorsten Alteholz
May 05, 2021   https://wiki.debian.org/LTS
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Package : exim4
Version : 4.89-2+deb9u8
CVE ID : CVE-2020-28007 CVE-2020-28008 CVE-2020-28009
CVE-2020-28011 CVE-2020-28012 CVE-2020-28013
CVE-2020-28014 CVE-2020-28015 CVE-2020-28017
CVE-2020-28019 CVE-2020-28020 CVE-2020-28021
CVE-2020-28022 CVE-2020-28023 CVE-2020-28024
CVE-2020-28025 CVE-2020-28026

The Qualys Research Labs reported several vulnerabilities in Exim, a mail
transport agent, which could result in local privilege escalation and
remote code execution.

Details can be found in the Qualys advisory at
  https://www.qualys.com/2021/05/04/21nails/21nails.txt

For Debian 9 stretch, these problems have been fixed in version
4.89-2+deb9u8.

We recommend that you upgrade your exim4 packages.

For the detailed security status of exim4 please refer to its security
tracker page at:   https://security-tracker.debian.org/tracker/exim4

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