Microsoft Outlook Remote Code Execution Vulnerability

According to the CVSS metric, the attack vector is local (AV:L). Why does the CVE title indicate that this is a remote code execution?
The word Remote in the title refers to the location of the attacker. This type of exploit is sometimes referred to as Arbitrary Code Execution (ACE). The attack itself is carried out locally. This means an attacker or victim needs to execute code from the local machine to exploit the vulnerability.

Is the Preview Pane an attack vector for this vulnerability?
No, the Preview Pane is not an attack vector.

According to the CVSS metric, user interaction is required (UI:R). What interaction would the user have to do?
Exploitation of the vulnerability requires that a user open a specially crafted file with an affected version of Microsoft Outlook software.
In an email attack scenario, an attacker could exploit the vulnerability by sending the specially crafted file to the user and convincing the user to open the file.

Security updates
https — https://docs.microsoft.com/en-us/officeupdates/office365-proplus-security-updates