The vqa_decode_chunk function in libavcodec/vqavideo.c in FFmpeg before 1.0.4 and 1.1.x before 1.1.2 allows remote attackers to have an unspecified impact via a large (1) cbp0 or (2) cbpz chunk in Westwood Studios VQA Video file, which triggers an out-of-bounds write.
https://security.gentoo.org/glsa/201603-06
http://www.ffmpeg.org/security.html
http://www.debian.org/security/2014/dsa-2855
http://git.videolan.org/?p=ffmpeg.git%3Ba=commitdiff%3Bh=f3d16706060ab6ae6dc78f15359fab3fd87c9495
http://git.videolan.org/?p=ffmpeg.git%3Ba=commitdiff%3Bh=08e2c7a45f82b897a285548c257972eb1ad352c5