An issue was discovered in Freeware Advanced Audio Decoder 2 (FAAD2) 2.8.1. There was a heap-based buffer overflow in the function excluded_channels() in libfaad/syntax.c.
https://www.debian.org/security/2019/dsa-4522
https://sourceforge.net/p/faac/bugs/240/
https://security.gentoo.org/glsa/202006-17
https://seclists.org/bugtraq/2019/Sep/28
https://lists.debian.org/debian-lts-announce/2019/08/msg00033.html