Provide references for CVE-2013-7021.
Where can I find more information about CVE-2013-7021?
References are available at: https://trac.ffmpeg.org/ticket/2905, https://security.gentoo.org/glsa/201603-06, http://ffmpeg.org/security.html, http://openwall.com/lists/oss-security/2013/12/08/3, http://openwall.com/lists/oss-security/2013/11/26/7, https://github.com/FFmpeg/FFmpeg/commit/cdd5df8189ff1537f7abe8defe971f80602cc2d2.