What is an Operational Security Officer (OSO)?
An Operational Security Officer (OSO) is responsible for the operational implementation of cybersecurity measures within industrial automation systems (OT). The OSO focuses specifically on applying, monitoring and improving security in operational technology such as PLCs, SCADA, DCS and field devices.
The OSO bridges policy and practice and works closely with IT, production, engineering and security teams.
🧠 Tasks and responsibilities
- Technical implementation
- Configures and maintains security measures in OT systems
- Examples: Firewall, Industrial Switch, network segmentation, Access Control, patch management
- Monitoring and incident detection
- Oversees real-time security status using tools such as SIEM, anomaly detection and Security Monitoring
- Analyses log files and detected anomalies
- Incident support
- Active role in the Incident Response Plan
- Cooperation with CSIRT or SOC in OT incidents
- Contributes to Forensics and root cause analysis
- Change & Asset Management
- Assesses the security impact of system changes (MOC)
- Oversees Asset Inventory and vulnerabilities
- Cooperation and communication
🏭 The OSO in industrial networks
| Activity | OT context |
|---|---|
| Switch configuration | VLANs, Port Security, redundancy protocols such as MRP |
| Firewall management | Industrial Firewall, Zoned Architecture, Protocol Filtering |
| Patching strategy | Coordinating updates on vulnerable but critical systems |
| Logging and detection | Syslog, SPAN and TAP monitoring on the Control Network |
| Segmentation and access | zone-and-conduits model, 802.1X, Least Privilege |
🔐 Skills and tools
- Knowledge of industrial protocols: Modbus, OPC UA, S7, Ethernet IP
- Use of tooling such as:
- Wireshark, Nessus, OT IDS (e.g. Nozomi, Claroty)
- Firewall management (e.g. Fortinet, Palo Alto, Hirschmann)
- Configuration management tools or Version Control systems
- Scripting and automation skills are a plus
👥 Relationship to other roles
| Role | Focus |
|---|---|
| OSO (Operational Security Officer) | Operational security execution |
| ISO (Information Security Officer) | Tactical policy and risk management |
| Security Officer | Day-to-day oversight of security processes |
| CISO | Strategic leadership and governance |
| OT Engineer | Engineering and installation management |
📌 In summary
The Operational Security Officer is an essential OT role that ensures security policy is actually applied, monitored and continuously improved. The OSO works hands-on in the field, close to production, and is crucial for the cyber resilience of industrial networks.