In an era where billions of connected devices form the nervous system of critical infrastructure, embedded IoT systems have become prime targets for cybercriminals, particularly given their enormous collective attack surface. IoT Analytics projects that the number of connected IoT devices will reach 18.8 billion by the end of 2024, up from approximately 16.6 billion at the end of 2023. This number is likely to continue growing, with the forecast also predicting as many as 40 billion devices by 2030. However, unlike traditional IT systems, embedded systems present a host of unique security challenges that necessitate a fundamental shift in how security leaders approach protection, compliance, and lifecycle management.

The Unique Vulnerabilities of Embedded Systems

At first glance, one might assume the cybersecurity principles that apply to servers and cloud systems would also cover embedded IoT devices. But that assumption is dangerously outdated. In fact, embedded systems are harder to secure than traditional IT systems. They can be attacked remotely or through physical access, and their credentials, such as VPN keys, database logins, and cloud service tokens, can be leveraged to launch broader attacks.

These systems are often deployed in places such as energy plants, defense systems, and medical equipment, where they may operate for decades without requiring updates. Unlike consumer tech that receives regular patches, embedded systems may go years without a single firmware upgrade, if they’re even updatable at all.

And even when a security flaw is discovered, pushing updates isn’t always feasible. Devices might be scattered across remote regions, or built on hardware too limited to support modern cryptographic protections.

Common Attack Vectors: From Default Passwords to Hardware Constraints

The vulnerabilities aren’t just theoretical. Many devices still ship with factory-default passwords, and if users don’t change them, attackers can find system manuals and gain access in minutes.

Memory constraints, lack of secure update mechanisms, and legacy operating systems all make post-deployment remediation challenging. “Security by design” isn’t just a catchphrase; it’s a requirement in a world where retrofitting is expensive, slow, or impossible.

At the same time, the consequences of exploiting these attack vectors can be far more serious than just stolen and compromised data. In the case of industrial and utility environments, attackers could disrupt production lines, cause physical damage, or exfiltrate proprietary data. Think nation-state attacks on critical infrastructure, such as Stuxnet.

Embedded military applications are also coming into play, with smart drones often containing critical military data that could put soldiers’ lives at risk. Healthcare and medical devices are also potential attack vectors for embedded security exploits. Patient safety is at risk if a device such as a heart pump or monitoring equipment is compromised.

Regulatory Pressure Is Building

Given these potential risks, governments and regulators are increasingly setting standards to mitigate these vulnerabilities. In the EU, regulations like the Radio Equipment Directive (RED), the Cyber Resilience Act (CRA), and NIS2 are raising the bar for IoT security. Violating the CRA, for instance, can lead to fines of up to €15 million or 2.5% of global turnover. Not to mention the loss of CE marking.

Other countries are introducing their own rules: California’s SB-327 IoT law, the FDA Act for medical devices in the U.S., and Japan’s IoT Security and Safety Framework (IoT-SSF), among others. Across the board, industry standards like EN 303 645, IEC 62443-4-2, and NISTIR 8259A are emerging as the baseline for compliance.

What “Security by Design” Actually Means

Regardless of geography, one message is consistent: security must be embedded from the start. “Security by design” means anticipating threat models before a single line of code is written, as well as evaluating who might want to tamper with a device, how they might do it, and what safeguards can block them.

This includes secure boot mechanisms, hardened access control, device identity verification, and built-in encryption, all ideally rooted in hardware.

Approaches can include an industrial-grade microSD card with a secure element, one that includes AES-256 encryption, access control, and real-time authentication features. The SD form factor is ideal, as most systems already use removable storage. As a result, it’s a seamless way to add a hardware root of trust. It acts like a digital ID card for IoT communications, and it can be retrofitted into devices in the field.

That flexibility is critical. With device lifecycles spanning decades, and threats evolving yearly, the ability to replace cryptographic credentials—or even upgrade them entirely – is a major win in the cat-and-mouse game of cyber defense.

The Bottom Line: Security Is a Lifecycle, Not a Checkbox

Securing embedded IoT systems is no longer an secondary concern—it’s a central challenge for modern CISOs. The combination of physical access risks, long product lifecycles, constrained hardware, and growing regulatory demands means organizations must act now.

The future belongs to systems that are secure by design, adaptable over time, and rooted in hardware-based trust. Anything less is an open invitation to attackers.