A thunderbird security update has been released for both Debian GNU/Linux 9 and 10 to address multiple security issues which could result in the setup of a non-encrypted IMAP connection, denial of service or potentially the execution of arbitrary code.

DSA 4702-1: thunderbird security update

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Debian Security Advisory DSA-4702-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
June 11, 2020   https://www.debian.org/security/faq
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Package : thunderbird
CVE ID : CVE-2020-12410 CVE-2020-12406 CVE-2020-12405
CVE-2020-12399 CVE-2020-12398

Multiple security issues have been found in Thunderbird which could
result in the setup of a non-encrypted IMAP connection, denial of service
or potentially the execution of arbitrary code.

For the oldstable distribution (stretch), this problem has been fixed
in version 1:68.9.0-1~deb9u1.

For the stable distribution (buster), this problem has been fixed in
version 1:68.9.0-1~deb10u1.

We recommend that you upgrade your thunderbird packages.

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

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/