The most dangerous device in your office is not the laptop. It is the copier

Most every firm of any significant size has one, a four-foot Xerox or Ricoh or Canon parked in the corner, scanning client documents to email, pulling from the directory, collating tax returns, Bates-stamping discovery, printing off financials. 

Nobody patches it. Nobody monitors it. Nobody can tell you what firmware it is running. When the lease ends, it goes back to the vendor with a hard drive full of everything it has ever scanned, and nobody asks where that drive goes next.

The multifunction printer is the perfect foothold. It lives on the production VLAN because it has to. It binds to Active Directory because scan-to-folder requires it, and in too many firms that bind account is a domain admin, because the vendor tech asked for it during install and nobody pushed back. It speaks SNMP, Telnet, FTP, and LDAP simple bind by default. Its web interface still answers to admin/admin. Its firmware is a full Linux distribution from 2019 with kernel CVEs older than some of your interns.

An attacker (this is one of my personal favorite attack vectors) who owns the MFP owns your documents. They intercept scan-to-email at the SMTP relay. They pull LDAP credentials off the device in cleartext. They stage payloads on the internal drive. They pivot to the file server using the bind account. They read every contract, every engagement letter, every PII-laden onboarding packet that crossed the glass in the last six months. When they are done, they use it as an outbound relay for internal phishing, because a message from the copier looks like the copier.

Then the lease ends. The device goes back. The drive carries eighteen months of scans. Nobody wipes it (ever). Nobody tracks chain of custody. Your regulator will not care that it was the vendor’s fault.

The vendor will tell you the drive is encrypted. Ask them for the key management policy and watch the silence. Encryption at rest means nothing when the device boots with the key in clear memory, when the vendor holds a master, and when the wipe at lease return is a checkbox on an invoice that nobody on your side has ever verified.

This is not theoretical. The CVE database is full of MFP firmware flaws. Every competent penetration test finds them. Ask your IT team three questions: (1) what account does the copier use to bind to AD, (2)when was the firmware last patched (it wasn’t), and (3)what is the disposition protocol for the hard drive at lease end. If they cannot answer in thirty seconds, you have a finding (and they can’t)

The obvious threats get the budget. The sleeper threats take the firm. This is a threat real hackers use not one they teach about for your book based certification.