A thunderbird security update has been released for Debian GNU/Linux 9 LTS to address multiple security issues that may lead to the execution of arbitrary code, denial of service or an information leak.

DLA 2541-1: thunderbird security update

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Debian LTS Advisory DLA-2541-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Emilio Pozuelo Monfort
February 02, 2021   https://wiki.debian.org/LTS
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Package : thunderbird
Version : 1:78.7.0-1~deb9u1
CVE ID : CVE-2020-15685 CVE-2020-16044 CVE-2020-26976 CVE-2021-23953
CVE-2021-23954 CVE-2021-23960 CVE-2021-23964

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

For Debian 9 stretch, these problems have been fixed in version
1:78.7.0-1~deb9u1.

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 LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://wiki.debian.org/LTS