Provide references for CVE-2015-6821.
Where can I find more information about CVE-2015-6821?
References are available at: http://git.videolan.org/?p=ffmpeg.git%3Ba=commit%3Bh=b160fc290cf49b516c5b6ee0730fd9da7fc623b1, https://lists.debian.org/debian-lts-announce/2018/12/msg00009.html, http://www.securitytracker.com/id/1033483, http://ffmpeg.org/security.html.