A thunderbird security update has been released for Debian GNU/Linux 10 to address multiple security issues, which may lead to the execution of arbitrary code or denial of service.

DSA 4780-1: thunderbird security update

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Debian Security Advisory DSA-4780-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
October 25, 2020   https://www.debian.org/security/faq
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Package : thunderbird
CVE ID : CVE-2020-15683 CVE-2020-15969

Multiple security issues have been found in Thunderbird, which may lead
to the execution of arbitrary code or denial of service.

For the stable distribution (buster), these problems have been fixed in
version 1:78.4.0-1~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/