7 Common Mistakes in ICS/OT Incident Response

In industrial environments, a cybersecurity incident becomes a physical issue with tangible operational consequences. With safety, continuity and brand reputation on the line, the stakes are incredibly high. Yet many industrial control system/operational technology (ICS/OT) incident response plans fail to account for the unique realities of these settings.

The Importance of Robust ICS/OT Incident Response

When applied to ICS and OT environments, standard information technology (IT) incident response methods are ineffective at best and damaging at worst. Unlike traditional IT systems, where the primary concern is data confidentiality, ICS and OT environments prioritize production line uptime and equipment availability.

A poorly executed response can halt production lines, compromise worker safety or trigger equipment failures. Moreover, the convergence of IT and OT networks has expanded the attack surface. These factors make specialized incident response protocols essential.

Critical Mistakes Both Engineers and Executives Make

Many organizations continue to apply conventional approaches to industrial cybersecurity incidents despite clear differences between information technology (IT) and OT environments. Here are common mistakes both engineers and executives make during ICS/OT incident response.

1. Utilizing Standard IT Tools for OT Security

Traditional security tools designed for enterprise networks can overload ICS that operate on limited bandwidth and processing power. A network vulnerability scanner that runs harmlessly on a corporate laptop can cause a programmable logic controller to lock up or enter fail-safe mode, triggering an unplanned shutdown across an entire production line.

2. Operating With Poor OT Network Visibility

Not knowing what assets exist on the network is dangerous. Detection becomes nearly impossible. Without full visibility, entities cannot detect attacks, let alone respond effectively.

According to a 2025 Siemens Energy report, 41% of OT cyberattacks go undetected. Businesses cannot defend against threats they cannot see, and incomplete asset inventories make it impossible to determine the full scope of a security incident.

In many cases, industrial facilities operate legacy equipment that was never designed to be networked, making asset discovery challenging. Attackers can exploit blind spots created by shadow connections, unauthorized devices and undocumented modifications.

3. Letting Legacy Infrastructure Run Independently

Aging infrastructure presents hidden risks. For example, synchronous motor clock systems generally maintain exceptional long-term accuracy. However, many have been in constant operation for over four decades, during which time a power outage or mechanical issue may have occurred. As a result, they may experience timestamp drift.

Small timing errors are easy to underestimate because they start small and seem negligible in isolation. However, the gradual loss of synchronization can have severe consequences for industrial operations, as these systems rely on precise timing for documentation, sequencing and safety protocols.

Accurate timestamps are critical for reconstructing attack timelines, correlating events across multiple platforms and determining the scope of compromise during incident response. When legacy infrastructure runs independently without synchronization to a common time source, incident reconstruction becomes unreliable or impossible.

4. Leaving IT and OT Systems Disconnected

A lack of coordination between IT and operational teams leads to confusion, delays and critical errors during a crisis. An IT security professional might order an immediate shutdown to contain the spread of malware, unaware that doing so could turn off safety interlocks on an active production line. Meanwhile, engineers may dismiss network anomalies as normal operational noise rather than recognizing them as attack indicators. When these groups operate in silos, response efforts become fragmented and ineffective.

The consequences manifest quickly during actual incidents. Security teams attempt to isolate compromised equipment without consulting operational engineers, potentially triggering unsafe conditions. Operations personnel prioritize keeping production running at all costs, even when doing so allows an attacker to maintain persistence or spread laterally through the network.

5. Underestimating the Scale of Cyberthreats

The official numbers do not reflect reality. Public reporting of OT incidents tends to focus on high-profile attacks against critical infrastructure, creating the impression that such incidents are rare. This selective visibility gives leadership a false sense of security about the threat landscape facing their industrial environments.

Data suggests the actual number of cyberattacks targeting OT environments is approximately 10 times higher than what is reported to regulators. This massive underreporting stems from various factors, including regulatory gaps, fear of reputational damage and the difficulty of definitively attributing operational disruptions to cyberattacks rather than equipment failures.

6. Lacking a Dedicated Incident Response Plan

Generic IT playbooks do not address the unique challenges of industrial settings. Without a dedicated, preapproved OT protocol, teams must coordinate with safety personnel, manage physical hazards during response activities and determine when to initiate emergency shutdown procedures with no clear guidance.

The absence of a tailored plan forces response teams to make critical decisions in real time without clear authority. Response becomes improvised, slow and largely ineffective, increasing the risk of errors and leading to inconsistent actions across different incidents or facilities.

7. Prioritizing System Uptime Over a Safe Shutdown

The IT team’s instinct is to isolate and contain, which may mean shutting things down. However, OT’s primary directive is to preserve system uptime. A failure to predefine when safety trumps uptime could lead to paralysis or disaster during crises. In some scenarios, keeping a compromised system running poses greater risks than initiating a controlled shutdown.

This tension between availability and security creates a dangerous dynamic during active incidents. Without clear decision criteria established in advance, enterprises may delay critical containment actions while debating the appropriate course of action, giving attackers additional time to cause damage.

Actionable Steps for a Robust Incident Response

To support safety and operational continuity, professionals must carefully avoid making common mistakes. Here are ways to address these issues before they escalate into full-scale crises.

1. Invest in OT-Specific Monitoring and Security

A survey found 32% of companies use IT solutions for operational security. Just 15% have deployed monitoring tools designed specifically for ICS. Moreover, 28% still rely on manual or ad-hoc coordination between security and operations. This gap represents a significant opportunity for improvement.

Professionals should deploy security tools built specifically for industrial environments. Purpose-built platforms account for the protocols, constraints and operational requirements of ICS, ensuring visibility without disrupting operations.

2. Develop a Response Plan With Clear Roles

A dedicated OT incident response plan is essential for industrial environments to preserve both uptime and security. It should define clear roles and responsibilities, establish decision-making authority for shutdown scenarios, and integrate safety protocols throughout response procedures.

Communication channels, escalation paths and coordination mechanisms between IT, OT and operational leadership must all be specified in advance.

3. Mandate Cross-Functional Training for IT and OT

Security and operational teams are now working together to preserve industrial safety, making joint training programs essential. IT personnel must learn the basics of operational safety and production priorities, while operations professionals must learn the fundamentals of cyber hygiene and threat detection. This cross-functional understanding reduces friction during incidents and enables more effective collaboration under pressure.

4. Conduct Process-Oriented Tabletop Exercises

Developing an incident response plan requires ongoing refinement and testing. Professionals must validate their plans to ensure they remain relevant and effective. Exercises should simulate real-world OT failures, such as a compromised programmable logic controller or loss of view for a human-machine interface, rather than just IT-based scenarios. These drills reveal gaps in procedures, clarify decision-making processes and build muscle memory for response teams.

From Reactive Measures to Proactive Industrial Resilience

Cybersecurity is a cross-functional risk requiring collaboration between IT and OT teams. Leadership must move beyond a reactive stance and invest in an engineering-led approach that recognizes the physical consequences of cyber incidents. Addressing common mistakes before they manifest during a crisis allows brands to build resilience that protects both digital systems and physical operations.