CVE-2021-22883

Node.js before 10.24.0, 12.21.0, 14.16.0, and 15.10.0 is vulnerable to a
denial of service attack when too many connection attempts with an
‘unknownProtocol’ are established. This leads to a leak of file
descriptors. If a file descriptor limit is configured on the system, then
the server is unable to accept new connections and prevent the process also
from opening, e.g. a file. If no file descriptor limit is configured, then
this lead to an excessive memory usage and cause the system to run out of
memory.