Core component of SQL Server for storing, processing, and securing data
I don't know anything about this vulnerability as such, but the inference of the sentence above is: Yes, you are.
In any case, SSMS is frequently updated, and there is little reason to stay with an old version. SSMS 21 has been out for a while now, and I would recommend that you download and install SSMS 21.
Since SSMS 21 installs in parallel with SSMS 20, I would also recommend that you either uninstall SSMS 20.0.2, or upgrade SSMS 20 to 20.2 to make sure that you are not exposed to this vulnerability.