When did you last update the firmware and credentials on your OT devices? If “never” is your answer, take comfort you are not alone, but you are in the crosshairs. As IT and OT networks converge, auditors are no longer ignoring the dusty boxes connecting your PLCs and serial-based equipment. They see them as unpatched entry points. And from your point of view, the pressure is on: Despite the pressing need to meet strict IT security requirements, you cannot afford the downtime usually required to fix them. The question isn’t whether you need to upgrade your edge connectivity, but rather how to achieve it without disrupting production.
Security through obscurity is no longer a defense for OT networks: it is a liability. Attackers are now targeting the network’s weak point: the edge layer. Unmanaged serial device servers or protocol gateways running on default passwords and data streams without proper protection are direct entry points into your critical infrastructure. Beyond simply annoying IT, ignoring them also creates an exploitable attack surface that puts your entire facility at risk, in both maintenance costs and regulatory penalties.
To bridge the gap, your edge connectivity must pass a rigorous litmus test. Do your current OT devices meet these seven criteria?
- Login Security: Can anyone log in to your devices using default account and passwords (like “admin” or “1234”) and get full access permissions? (Requirement: Forced Credential Update & Role-based Authorization)
- Data Encryption: Is the data traveling between your serial device and the network readable by anyone with a wiretap? (Requirement: Encryption / Authentication / Certificate)
- Access Control: Can any random computer on the network connect to your critical serial devices? (Requirement: IP Whitelisting / Access Control List (ACL) / Service Disable)
- Antitampering: If a hacker installs fake firmware on your device, will the device refuse to run it? (Requirement: Secure Boot/Hardware Root of Trust)
- Digital Footprints: If someone changes a setting or reboots a device at 3 am, will you have a record of who did it? (Requirement: System Log / Incident Logging / Timestamp)
- Mass Management: Do you have a central way to manage user accounts and event log, or do you manage these device-by-device? (Requirement: RADIUS, TACACS+ / Remote Syslog / RFC format)
- Security Updates: Have your devices received any security patches or firmware updates in the last 24 months? (Requirement: Vendor vulnerability management)
Security is not merely a sunk cost; inaction is a debt. Consider the operating expense (OpEx) of manual maintenance: patching 200 unmanaged edge nodes one-by-one takes roughly 50 workhours. We are talking about weeks of lost productivity, and this needs to happen every three months. By automating your edge, you can eliminate hidden technical debt. This simultaneously protects you from the severe financial consequences of a breach or unexpected downtime and, most importantly, ensures regulatory compliance to avoid penalties. Regulations are shifting from best practice to legal requirement. With the EU’s Cyber Resilience Act (CRA) targeting enforcement by 2027, today’s investments must be ready for tomorrow’s laws. Don’t waste capital expenditure (CapEx) on unsecured connectivity. Choose solutions like the Moxa NPort and MGate G2 Series that are aligned with IEC 62443 and built for evolving compliance requirements.
It is time to close the gap between IT and OT. So, stop choosing between security and stability and turn your connectivity into a competitive advantage.
Take the 60-second Edge Security Assessment to get your personalized readiness score. Discover your technical security gaps and understand the risk of your current edge security status.