What Is SCADA, OT and IoT Security Testing?

Industrial Control Systems (ICS), SCADA (Supervisory Control and Data Acquisition), Operational Technology (OT) and the Internet of Things (IoT) are the systems that run critical industrial processes — from manufacturing plants and power stations to water treatment facilities and oil and gas infrastructure.

SCADA, OT and IoT security testing is a controlled security assessment carried out to evaluate the cyber security posture of industrial control systems, automation infrastructure, PLC devices, RTUs, HMI systems, industrial networks and IoT devices.

The assessment covers far more than network-level controls: industrial communication protocols, device authentication mechanisms, remote access systems, production networks, SCADA software and the wider OT infrastructure are all analysed using real attack scenarios.

The objective is to reduce risk by identifying — before an attacker does — the vulnerabilities that could affect production continuity, operational safety and critical infrastructure.

SecureSys SCADA, OT and IoT security tests are conducted in line with IEC 62443, NIST SP 800-82, the NIST Cybersecurity Framework (CSF), MITRE ATT&CK for ICS, ISA/IEC 62443 and other international industrial cyber security standards.

Why Should You Run a SCADA, OT and IoT Security Test?

Unlike in IT systems, a security breach in an OT or SCADA environment does not merely cost data. It can halt production, damage physical equipment and create conditions that endanger people.

In critical sectors such as energy, manufacturing, defence, petrochemicals, transport and water management, a cyber attack has a direct effect on operational processes.

A misconfigured SCADA or OT infrastructure can lead to:

Production lines coming to a stop
PLC devices being manipulated
Sensor data being altered
Industrial processes being disrupted
Unauthorised remote access
Service outages
Risk to critical infrastructure
Loss of business continuity
Financial loss
Regulatory breaches

Testing SCADA, OT and IoT systems on a regular basis is therefore essential.

What Are SCADA, OT and IoT Systems?

SCADA (Supervisory Control and Data Acquisition)

SCADA systems are the central monitoring and control platforms used in energy, water, manufacturing, oil, gas and critical infrastructure.

SCADA platforms provide:

Alarm management
Process monitoring
Remote control
Data acquisition
Operations management

OT (Operational Technology)

Operational Technology covers all the hardware and software components that manage physical processes.

An OT environment typically brings together:

PLC
RTU
HMI
SCADA
DCS
Historian
Industrial switches
Industrial firewalls

IoT (Internet of Things)

IoT devices are physical devices that communicate over the internet — sensors, cameras, smart meters, production equipment and industrial control hardware.

A misconfigured IoT device can be used by an attacker as an entry point into the OT network.

Scope of the Service

SecureSys SCADA, OT and IoT security testing covers the following systems.

SCADA Platforms

Siemens WinCC
Schneider EcoStruxure
GE iFIX
Ignition SCADA
AVEVA System Platform
Wonderware
ICONICS
Citect SCADA

PLC Security

Siemens S7
Schneider Modicon
Allen-Bradley
Omron PLC
Mitsubishi PLC
ABB PLC
Beckhoff PLC
Delta PLC

HMI Security

Siemens HMI
Pro-face
Weintek
Schneider HMI
Allen-Bradley PanelView

DCS Security

Siemens PCS7
ABB 800xA
Honeywell Experion
Yokogawa CENTUM
Emerson DeltaV

RTU Security

Remote terminal units
Telemetry systems
Remote monitoring

IoT Security

IP cameras
Sensors
Smart meters
Gateway devices
IoT platforms
MQTT brokers
CoAP services

Industrial Communication Protocols

SecureSys testing analyses the following industrial protocols.

Modbus TCP
Modbus RTU
DNP3
OPC Classic
OPC UA
BACnet
PROFINET
EtherNet/IP
EtherCAT
S7 protocol
IEC 60870-5-104
IEC 61850
MQTT
CoAP

Vulnerabilities Covered

Unauthorised PLC access
Default user accounts
Weak password policies
Firmware vulnerabilities
Insecure remote access
VPN misconfiguration
Inadequate network segmentation
Flat network architecture
Modbus manipulation
Missing OPC authorisation
MQTT authentication weaknesses
HMI vulnerabilities
SCADA software vulnerabilities
IoT firmware vulnerabilities
Shadow IoT devices
Industrial DDoS scenarios
Man-in-the-middle (MITM)
Replay attacks
Command injection
Buffer overflow
Insecure protocols
Insecure configurations

What Is IEC 62443?

IEC 62443 is the family of international security standards developed to secure Industrial Automation and Control Systems (IACS). It defines comprehensive requirements for the secure design, implementation and operation of SCADA systems, PLC devices, DCS infrastructure, HMI terminals, RTU systems and other Operational Technology components.

IEC 62443 goes beyond technical controls to cover risk management, network segmentation, secure system architecture, access control, patch management and lifecycle security. It is one of the most important reference standards for energy, manufacturing, oil and gas, water management, transport and critical infrastructure operators.

SecureSys SCADA and OT security tests follow IEC 62443, assessing the security posture of industrial control systems against international best practice.

MITRE ATT&CK for ICS

MITRE ATT&CK for ICS is an international knowledge base that models real adversary behaviour against industrial control systems. The framework describes in detail how attackers gain access to SCADA systems, PLC devices, DCS infrastructure and OT networks, which techniques they use, and how they can affect production processes.

The framework covers attack stages including:

Initial access
Execution
Persistence
Privilege escalation
Discovery
Lateral movement
Collection
Command and control
Inhibit response function
Impair process control
Impact

SecureSys testing uses the MITRE ATT&CK for ICS matrix as a reference, simulating the techniques real threat actors would use under controlled conditions and verifying how effective the existing defences are.

Differences Between IT and OT Security

IT and OT are two distinct worlds with different security priorities. In IT, the goal is to protect the confidentiality, integrity and availability of data (the CIA triad). In OT, the priority is keeping physical processes running safely and without interruption.

As a result, many security practices that are routine in IT cannot be applied directly in an OT environment, because they risk disrupting the production line.

Information Technology (IT)	Operational Technology (OT)
Focused on data security	Focused on operational continuity
Confidentiality comes first	Continuity and safety come first
Updates can be applied frequently	Updates are applied during planned maintenance
Systems can be restarted	An outage can stop production
Standard operating systems are used	PLC, RTU, HMI and SCADA systems are used
TCP/IP services are widespread	Industrial protocols are used
Security tooling is easy to deploy	Tooling must not affect production

SCADA and OT security testing must therefore follow a different methodology from a conventional IT penetration test, and be carried out carefully and under close control.

Common Attacks Against SCADA Systems

Because they run critical infrastructure, SCADA systems are a priority target for advanced threat actors. Modern attacks aim not simply to steal information but to manipulate physical processes and disrupt production continuity.

SecureSys SCADA security testing evaluates the following attack scenarios.

Unauthorised Access

Access to SCADA management interfaces
Default user accounts
Weak password policies
Missing authentication controls

PLC Manipulation

PLC program modification
Logic upload and download
Unauthorised command injection
Program integrity checks

Protocol Attacks

Modbus manipulation
DNP3 manipulation
OPC authorisation weaknesses
S7 protocol analysis
IEC 104 attack scenarios

Network Attacks

ARP spoofing
Man-in-the-middle
Replay attacks
Network discovery
Lateral movement

Denial of Service

SCADA DoS
PLC DoS
HMI DoS
Industrial DDoS
Protocol flood scenarios

Operational Manipulation

Alteration of sensor data
Alarm manipulation
Modification of process parameters
Remote control scenarios

PLC Vulnerabilities

Programmable Logic Controllers are the fundamental building blocks of industrial automation. Because PLCs directly control production processes, a vulnerability affects not only information systems but the physical process itself.

SecureSys PLC security testing performs the following checks.

Default user accounts
Unauthorised program upload
Firmware vulnerabilities
Program integrity verification
Secure boot implementation
Authentication mechanisms
PLC communication security
Modbus and S7 security
Permission management
Remote access security
Update management
Configuration security

Supported vendors include the widely deployed PLC platforms from Siemens, Schneider Electric, Rockwell Automation (Allen-Bradley), ABB, Mitsubishi Electric, Omron, Beckhoff and Delta.

Industrial Network Segmentation

Network segmentation is one of the most critical controls in an industrial network. Without proper security layers between the production network and the corporate IT network, an attacker can move laterally from the office environment into the production systems.

SecureSys testing analyses the following when assessing network segmentation.

Separation of IT and OT networks
ISA/IEC 62443 zone and conduit architecture
Security zones
Industrial DMZ (IDMZ)
VLAN configuration
Firewall policy
Use of jump servers
Remote access controls
Vendor access security
Gateways and data flows

Correct segmentation significantly limits how far a cyber attack can spread into the production line or critical control systems.

Why SecureSys?

Security testing in industrial control systems demands a completely different discipline from conventional IT penetration testing. Because production continuity, worker safety and the protection of physical equipment come first, testing must be controlled, planned and carried out without disturbing operations.

At SecureSys we conduct SCADA, OT and IoT security testing across industrial automation systems, PLC devices, HMI terminals, DCS infrastructure and critical production networks, using methodologies aligned with international standards. Our testing is grounded in real attacker techniques, but every scenario is planned to preserve production continuity.

The SecureSys Difference

Expert penetration testing under TSE TS 13638
Security assessment aligned with IEC 62443 and NIST SP 800-82
Attack scenarios referenced against MITRE ATT&CK for ICS
Comprehensive analysis of SCADA, PLC, HMI, DCS, RTU and IoT systems
Security testing of Modbus, DNP3, OPC UA, PROFINET, EtherNet/IP, IEC 61850 and other industrial protocols
Assessment of network segmentation and ISA/IEC 62443 zone and conduit architecture
A controlled testing approach that protects production continuity
Detailed reporting at both technical and executive level
Risk prioritisation with actionable remediation guidance
Post-remediation retest support

SCADA, OT and IoT Security Testing Service