You want to know if vulnerability CVE-2022-0847 affects the Messaging Gateway appliance.
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Messaging Gateway is not impacted by vulnerability CVE-2022-0847 in version 10.7.5 or newer.
As of the publishing of this article, Messaging Gateway 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.