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Regarding the vulnerability: it's a legit find and I applaud CCC for their work. But I think they overstate the popularity of T.30. And certainly color faxes are rare. JPG buffer overflow is a classic problem; interesting that they are still finding instances of that.
Of course the simple fix is to have the RX fax be standalone, not a LAN-attached MFD. For TX, it can be LAN-attached w/out inbound calls, or it can be a fax card.