Woah, #PaloAlto: Silently fixed a pre-authentication remote code execution vulnerability in their VPN portal a year ago, and did not notify their customer. Anyone who didn't update their PanOS during the past year is still vulnerable (CVE-2019-1579).
http://blog.orange.tw/2019/07/attacking-ssl-vpn-part-1-preauth-rce-on-palo-alto.html