The short answer is that “Remote Code Execution” in Microsoft’s CVE title describes the impact class, not necessarily the CVSS attack vector. Microsoft’s own guidance and long-standing MSRC usage show that a vulnerability can be labeled RCE even when exploitation requires local user interaction...
Yes — the apparent mismatch comes from Microsoft using two different layers of description.
The CVSS field AV:L is describing the attack vector in scoring terms: the exploit has to be triggered through a local file-processing path on the victim machine, usually by opening or otherwise handling a...