A firefox security update has been released for Arch Linux.

ASA-202101-5: firefox: arbitrary code execution

Arch Linux Security Advisory ASA-202101-5
========================================
Severity: Critical
Date : 2021-01-08
CVE-ID : CVE-2020-16044
Package : firefox
Type : arbitrary code execution
Remote : Yes
Link :   https://security.archlinux.org/AVG-1413

Summary
======
The package firefox before version 84.0.2-1 is vulnerable to arbitrary
code execution.

Resolution
=========
Upgrade to 84.0.2-1.

# pacman -Syu "firefox>?.0.2-1"

The problem has been fixed upstream in version 84.0.2.

Workaround
=========
None.

Description
==========
A security issue was found in Firefox before 84.0.2. A malicious peer
could have modified a COOKIE-ECHO chunk in a SCTP packet in a way that
potentially resulted in a use-after-free. Mozilla presumes that with
enough effort it could have been exploited to run arbitrary code.

Impact
=====
A remote attacker might be able to execute arbitrary code via a crafted
SCTP packet.

References
=========
  https://www.mozilla.org/en-US/security/advisories/mfsa2021-01/#CVE-2020-16044
  https://bugzilla.mozilla.org/show_bug.cgi?id83964
  https://hg.mozilla.org/mozilla-central/rev/08ba03dc8d4420e04e7c77fee3013e68180e6ead
  https://hg.mozilla.org/mozilla-central/rev/8c09f4813fc7e8f44605b6092262199bff15cdd7
  https://hg.mozilla.org/mozilla-central/rev/5991645a87d2abf289686d09d943229c9e3e54b5
  https://security.archlinux.org/CVE-2020-16044