Netty 4.1.43.Final allows HTTP Request Smuggling because it mishandles Transfer-Encoding whitespace (such as a [space]Transfer-Encoding:chunked line) and a later Content-Length header. This issue exists because of an incomplete fix for CVE-2019-16869.
https://www.debian.org/security/2021/dsa-4885
https://lists.debian.org/debian-lts-announce/2020/09/msg00003.html
https://lists.debian.org/debian-lts-announce/2020/02/msg00018.html
https://lists.debian.org/debian-lts-announce/2020/02/msg00017.html
https://github.com/jdordonezn/CVE-2020-72381/issues/1
https://access.redhat.com/errata/RHSA-2020:0811
https://access.redhat.com/errata/RHSA-2020:0806
https://access.redhat.com/errata/RHSA-2020:0805
https://access.redhat.com/errata/RHSA-2020:0804
https://access.redhat.com/errata/RHSA-2020:0606
https://access.redhat.com/errata/RHSA-2020:0605
https://access.redhat.com/errata/RHSA-2020:0601