we are using "Greenbone" to check our internal network for old or unsecure software.
We have a match for our UTM Firewall (newest version). There was already a post some time ago --- but no solution
You can ignore this warning. The developers find it easier to add fixes to existing versions of the various tools in the UTM than to constantly be testing and vetting new versions. If you're not satisfied with my answer, you will want to open a ticket with Sophos Support. Please share their answer with us if you do.
Cheers - Bob