ProFTPD before 1.3.6b and 1.3.7rc before 1.3.7rc2 allows remote unauthenticated denial-of-service due to incorrect handling of overly long commands because main.c in a child process enters an infinite loop.
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2019-18217.json"