Dear, this August, a Serious vulnerability has been detected on windows servers 2008 R2 through 2019.
We leave the article for you to take a look. https://www.ccn-cert.cni.es/seguridad-al-dia/alertas-ccn-cert/10477-ccn-cert-al-09-20-vulnerabilidad-zerologon.html
You can rest assured that between today and tomorrow, all the servers we manage will already have the preventive solution in place.