Unspecified vulnerability in the avcodec_close function in libavcodec/utils.c in FFmpeg 0.4.9 before r14787, as used by MPlayer, has unknown impact and attack vectors, related to a free "on random pointers."
https://exchange.xforce.ibmcloud.com/vulnerabilities/46325
http://www.openwall.com/lists/oss-security/2008/10/29/6
http://security.gentoo.org/glsa/glsa-200903-33.xml
http://secunia.com/advisories/34385
http://lists.mplayerhq.hu/pipermail/ffmpeg-cvslog/2008-August/016136.html
http://archives.neohapsis.com/archives/fulldisclosure/2008-09/0103.html