You want to know if the Messaging Gateway is impacted by CVE-2022-2097.
Symantec Messaging Gateway (SMG)
Messaging Gateway is not impacted by vulnerability CVE-2022-2097 in version 10.7.5 or newer.
As of the publishing of this article, Messaging Gateway version 10.7.5 is the current fully supported release, previous versions have not been evaluated. It is highly recommended to keep the Messaging Gateway fully updated to have access to the latest security updates.