A heap-use-after-free in the mpeg_mux_write_packet function in libavformat/mpegenc.c of FFmpeg 4.2 allows to cause a denial of service (DOS) via a crafted avi file. CREATE(Triage):(User=admin) CVE-2020-21697 (https://nvd.nist.gov/vuln/detail/CVE-2020-21697)
