A NULL pointer dereference in help() at inetutils/telnet/commands.c of GNU Inetutils v2.2.16-cf091 can lead to a segmentation fault or application crash.
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-45774
launchpad.net/bugs/cve/CVE-2021-45774
lists.gnu.org/archive/html/bug-inetutils/2021-12/msg00006.html
nvd.nist.gov/vuln/detail/CVE-2021-45774
security-tracker.debian.org/tracker/CVE-2021-45774