Stack-based buffer overflow in the clntudp_call function in sunrpc/clnt_udp.c in the GNU C Library (aka glibc or libc6) allows remote servers to cause a denial of service (crash) or possibly unspecified other impact via a flood of crafted ICMP and UDP packets.
https://www.oracle.com//security-alerts/cpujul2021.html
https://usn.ubuntu.com/3759-2/
https://usn.ubuntu.com/3759-1/
https://sourceware.org/git/gitweb.cgi?p=glibc.git%3Bh=bc779a1a5b3035133024b21e2f339fe4219fb11c
https://sourceware.org/bugzilla/show_bug.cgi?id=20112
https://source.android.com/security/bulletin/2017-12-01
https://lists.debian.org/debian-lts-announce/2020/06/msg00027.html
http://www.securityfocus.com/bid/102073
http://lists.opensuse.org/opensuse-updates/2016-07/msg00039.html
http://lists.opensuse.org/opensuse-updates/2016-06/msg00030.html