A libetpan security update has been released for Debian GNU/Linux 9 LTS to address a STARTTLS response injection.

DLA 2329-1: libetpan security update

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Debian LTS Advisory DLA-2329-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/
August 16, 2020   https://wiki.debian.org/LTS
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Package : libetpan
Version : 1.6-3+deb9u1
CVE ID : CVE-2020-15953
Debian Bug : 966647

In libEtPan, a mail library, a STARTTLS response injection was
discovered that affects IMAP, SMTP, and POP3.

For Debian 9 stretch, this problem has been fixed in version
1.6-3+deb9u1.

We recommend that you upgrade your libetpan packages.

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

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