References https://www.cnvd.org.cn/flaw/show/CNVD-2021-49549 http://wy.zone.ci/bug_detail.php?wybug_id=wooyun-2014-076518 https://www.tenable.com/plugins/nessus/51875 https://medium.com/iron-breach/%EF%B8%8F-nothing-hidden-exposing-netmons-deadly-secrets-1948b32bc426 https://www.exploit-db.com/exploits/46527 https://codewatch.org/2018/06/25/prtg-18-2-39-command-injection-vulnerability/