Microsoft Exchange Server Remote Code Execution Vulnerability

According to the CVSS metric, the attack vector is network (AV:N) and the user interaction is none (UI:N). What is the target used in the context of the remote code execution?
The attacker for this vulnerability could target the server accounts in an arbitrary or remote code execution. As an authenticated user, the attacker could attempt to trigger malicious code in the context of the server's account through a network call.

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.

Security updates
15.00.1497.033 — https://support.microsoft.com/help/5010324
15.01.2308.027 — https://support.microsoft.com/help/5012698