Microsoft Exchange Server Spoofing Vulnerability

According to the CVSS metric, the attack vector is adjacent (AV:A). What does that mean for this vulnerability? An authenticated attacker could exploit this vulnerability with LAN access.

According to the CVSS metric, privileges required is low (PR:L). Does the attacker need to be in an authenticated role on the Exchange Server? Yes, the attacker must be authenticated with LAN-access and have credentials for a valid Exchange user.

How could an attacker exploit this vulnerability? An attacker could exploit the vulnerability by leveraging the known (Type 4) UnitySerializationHolder gadget through a deserialization of untrusted data. Exploitation of this vulnerability requires that a user gain LAN-access as well as obtain credentials for a valid Exchange user.