An issue was discovered in Freeware Advanced Audio Decoder 2 (FAAD2) 2.8.1. There is a NULL pointer dereference in ifilter_bank() in libfaad/filtbank.c.
https://www.debian.org/security/2019/dsa-4522
https://sourceforge.net/p/faac/bugs/240/
https://security.gentoo.org/glsa/202006-17