What is a cyber-physical attack?

A cyber-physical attack is a type of security attack that targets systems where digital (cyber) components control physical processes. These systems are often called cyber-physical systems (CPS).

Understanding a cyber-physical attack

A cyber-physical attack occurs when a hacker doesn’t just steal data or crash software but also causes real-world physical effects by manipulating computers that control machines or infrastructure. According to Cybersecurity at MIT Sloan, “A cyber-attack to a CPS is more than just a threat to virtual space; it can create real, physical hazards… With physical manifestations in the real world, attacks on a CPS can cause disruption to physical services or create a national disaster.”

An example of a CPS attack, presented by CISA, is when heating, ventilation, and air conditioning (HVAC) systems are “overridden, causing a rise in temperature that renders network servers inoperable.”

Types of CPS attacks

Cyber-physical systems are vulnerable to a variety of attacks that target both digital infrastructure and the physical processes these systems control. According to the study Security Control of Cyber–Physical Systems under Cyber Attacks: A Survey, CPS attacks can be broadly classified based on how they interfere with data, communication, and system control mechanisms.

False data injection attacks (FDI)

According to the same study, “FDI attacks are a form of attack where falsified information is injected into control systems by tampering with sensor data.” Because CPS rely heavily on real-time data to make decisions, even small alterations can result in significant physical consequences. For example, falsified temperature or pressure readings in an industrial system could trigger unsafe operations.

Denial-of-Service (DoS) attacks

Denial-of-Service (DoS) attacks aim to disrupt the availability of a system by overwhelming it with excessive traffic or requests. The study notes, “For CPSs, a DoS attack can have severe consequences. CPSs rely on real-time data collection, transmission, and processing to ensure the effective control and monitoring of physical processes. If a CPS is subjected to a DoS attack, it may result in the system being unable to respond promptly to changes in the physical environment, leading to control failures and data loss.”

Read also: What is the difference between a DoS or a DDoS attack?

Replay attacks

The study explains that a replay attack is a “common type of network security attack. Its fundamental principle involves an attacker intercepting previous communication traffic without authorization and then replaying it to the target system to deceive, impersonate, or replicate previous communication actions.” This can trick the system into responding to outdated or incorrect information. Since the data appears authentic, these attacks can be difficult to detect and may lead to improper system behavior.

Best practices for securing CPSs

Securing a CPS requires addressing both the digital and physical domains simultaneously. As noted in the study Cyber-physical systems security: Limitations, issues and future trends, the best practices for securing CPS security include:

Implementing intrusion detection systems (IDS)

Intrusion Detection Systems (IDS) can identify malicious activity within CPS environments. These systems monitor network traffic and system behavior to detect potential threats. The article notes that “intrusion detection systems are used to detect malicious activities in the network,” demonstrating their foundational role in CPS defense. Signature-based IDS can detect known threats, while anomaly-based systems are better suited for identifying novel or previously unseen attacks.

Using anomaly detection and behavioral monitoring

Developing baseline models of normal system behavior allows organizations to detect deviations that may indicate an attack. This is particularly important in CPS, where minor anomalies can have major physical consequences. The authors of the study emphasise that “anomaly-based detection identifies deviations from normal behaviour,” making it a powerful tool for uncovering sophisticated or emerging threats.

Strengthen network monitoring and data analysis

Continuous monitoring of communication networks can help in the early detection of cyber threats. Analyzing traffic patterns, packet sizes, and communication frequency can reveal suspicious activity. According to the article, “Network monitoring helps in identifying abnormal traffic patterns,” reinforcing the importance of visibility across CPS networks.

Using advanced detection techniques.

Advanced methods such as machine learning, deep packet inspection, and intelligent detection frameworks can enhance CPS security by identifying subtle or complex attack patterns. The study notes that “intelligent techniques improve detection accuracy,” particularly in environments where traditional methods may fall short.

Ensuring skilled security management

The article stresses that “the performance of detection systems depends on proper configuration and expertise,” indicating the benefit of trained personnel and well-defined security policies.

Adopting a layered and adaptive security approach

Organizations should implement a layered strategy that combines multiple defensive mechanisms. As the article explains, CPS security requires “a combination of different techniques to ensure robust protection,” particularly given the evolving nature of cyber threats.

See also: HIPAA Compliant Email: The Definitive Guide (2026 Update)

FAQS

Why are cyber-physical attacks dangerous?

Cyber-physical attacks are dangerous because they can lead to consequences, such as power outages, equipment failure, or safety risks in healthcare and transportation systems.

What industries are most at risk?

Industries that rely heavily on CPS are most vulnerable, including:

• Energy and utilities
• Healthcare
• Manufacturing
• Transportation
• Smart infrastructure and cities

How are CPS attacks different from traditional cyberattacks?

Traditional cyberattacks mainly affect data and software, while CPS attacks extend beyond the digital space to impact physical systems and infrastructure, making them more complex and potentially more harmful.