A flaw was found in the AD DC NBT server in all Samba versions before 4.10.17, before 4.11.11 and before 4.12.4. A samba user could send an empty UDP packet to cause the samba server to crash.
https://www.samba.org/samba/security/CVE-2020-14303.html
https://usn.ubuntu.com/4454-2/
https://usn.ubuntu.com/4454-1/
https://security.netapp.com/advisory/ntap-20200709-0003/
https://security.gentoo.org/glsa/202007-15
https://lists.debian.org/debian-lts-announce/2020/11/msg00041.html
https://bugzilla.redhat.com/show_bug.cgi?id=1851298%3B
http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00002.html
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00054.html
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00030.html