A thunderbird security update has been released for both Debian GNU/Linux 9 and 10.

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Debian Security Advisory DSA-4625-1 security@debian.org
https://www.debian.org/security/ Moritz Muehlenhoff
February 15, 2020 https://www.debian.org/security/faq
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Package : thunderbird
CVE ID : CVE-2020-6792 CVE-2020-6793 CVE-2020-6794 CVE-2020-6795
CVE-2020-6798 CVE-2020-6800

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

For the oldstable distribution (stretch), these problems have been fixed
in version 1:68.5.0-1~deb9u1.

For the stable distribution (buster), these problems have been fixed in
version 1:68.5.0-1~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/