In KDE KMail 19.12.3 (aka 5.13.3), the SMTP STARTTLS option is not honored (and cleartext messages are sent) unless "Server requires authentication" is checked.
{ "cpe": "cpe:2.3:a:kde:kmail:19.12.3:*:*:*:*:*:*:*", "extracted_events": [ { "introduced": "19.12.3" }, { "last_affected": "19.12.3" } ], "source": "CPE_STRING" }
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-38373.json"