Compromise a network through the fax on a MFP?

[reswob10 at gmail.com (craig bowser)]

I know I've seen info about this before, but my google skills are lacking
this morning.

On a MFP (printer/copier/fax), how possible is it today to compromise a
printer via the fax modem and gain access to either

1.  the stored jobs or
2. the network to which it is attached.

Several printer vendors I've asked have said that there is an air gap
between the fax component and the network components making it nearly
impossible to go from one side to the other.  But, I'm wondering if anyone
out there has seen/read anything actual.

Thanks.

Craig
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