The flashsv_decode_frame function in libavcodec/flashsv.c in FFmpeg before 2.1 does not properly validate a certain height value, which allows remote attackers to cause a denial of service (out-of-bounds array access) or possibly have unspecified other impact via crafted Flash Screen Video data.
https://trac.ffmpeg.org/ticket/2844
https://security.gentoo.org/glsa/201603-06
https://github.com/FFmpeg/FFmpeg/commit/880c73cd76109697447fbfbaa8e5ee5683309446
https://euvd.enisa.europa.eu/vulnerability/EUVD-2013-6816
http://www.debian.org/security/2014/dsa-2855
http://openwall.com/lists/oss-security/2013/12/08/3