SSRF exists in Webmin 1.850 via the PATH_INFO to tunnel/link.cgi, as demonstrated by a GET request for tunnel/link.cgi/http://INTRANET-IP:8000.
{ "versions": [ { "introduced": "0" }, { "last_affected": "1.850" } ] }
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2017-15644.json"