A mutt security update has been released for Debian GNU/Linux 9 and 10 to address two security issues in the STARTTLS handling of the Mutt mail client.

DSA 4707-1: mutt security update

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Debian Security Advisory DSA-4707-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
June 19, 2020   https://www.debian.org/security/faq
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Package : mutt
CVE ID : CVE-2020-14093

Damian Poddebniak and Fabian Ising discovered two security issues in the
STARTTLS handling of the Mutt mail client, which could enable MITM
attacks.

For the oldstable distribution (stretch), these problems have been fixed
in version 1.7.2-1+deb9u3.

For the stable distribution (buster), these problems have been fixed in
version 1.10.1-2.1+deb10u2.

We recommend that you upgrade your mutt packages.

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

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://www.debian.org/security/