A thunderbird security update has been released for Debian GNU/Linux 9 and 10 to address multiple security issues which could potentially result in the execution of arbitrary code.

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Debian Security Advisory DSA-4642-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
March 19, 2020   https://www.debian.org/security/faq
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Package : thunderbird
CVE ID : CVE-2019-20503 CVE-2020-6805 CVE-2020-6806 CVE-2020-6807
CVE-2020-6811 CVE-2020-6812 CVE-2020-6814

Multiple security issues have been found in Thunderbird which could
potentially result in the execution of arbitrary code.

For the oldstable distribution (stretch), these problems have been fixed
in version 1:68.6.0-1~deb9u1.

For the stable distribution (buster), these problems have been fixed in
version 1:68.6.0-1~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/