A firefox-esr security update has been released for Debian GNU/Linux 9 LTS to address multiple security issues, which could potentially result in the execution of arbitrary code, information disclosure or CSS sanitiser bypass.

DLA 2496-1: firefox-esr security update

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Debian LTS Advisory DLA-2496-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Emilio Pozuelo Monfort
December 16, 2020   https://wiki.debian.org/LTS
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Package : firefox-esr
Version : 78.6.0esr-1~deb9u1
CVE ID : CVE-2020-16042 CVE-2020-26971 CVE-2020-26973 CVE-2020-26974
CVE-2020-26978 CVE-2020-35111 CVE-2020-35113

Multiple security issues have been found in the Mozilla Firefox web
browser, which could potentially result in the execution of arbitrary
code, information disclosure or CSS sanitiser bypass.

For Debian 9 stretch, these problems have been fixed in version
78.6.0esr-1~deb9u1.

We recommend that you upgrade your firefox-esr packages.

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

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