I have found this interesting article: https://borncity.com/win/2021/07/27/remotepotato0-privilege-escalation-schwachstelle-im-windows-rpc-protocol/
This article refers to: https://labs.sentinelone.com/relaying-potatoes-dce-rpc-ntlm-relay-eop/
The latter states that this so-called 'remotepotato0-privilege-escalation' has been reported to Microsoft: 11/30/2020 – Submitted vulnerability to MSRC case 62293
and lists a statement from MS: 4/13/2021 – Microsoft informed us that, after an extensive review, they determined that “Servers must defend themselves against NTLM relay attacks” (side note: setting the sign flag in NTLM provider as well as SPNEGO would have inhibited this exploit…)
Is there any CVE out there, which handles this case? Is there any OFFICIAL statement from Microsoft? Does anyone have more information on detailed mitigation for this exploit?