Integrated building security is now a key industry focus, as escalating cybersecurity risks across HVAC, lighting, access control, energy, and building management systems drive stakeholders to pursue unified standards. In Europe, the EU's NIS2 Directive, effective October 2024, expands cybersecurity requirements to include building automation systems supporting essential services. These requirements mandate device-level authentication, encryption, access controls, incident detection, compulsory incident reporting, and may impose fines up to €10 million or 2% of global turnover. NIS2 also renders integrators and building automation contractors jointly liable for security failures. Veridify Security advises building operators to comply with these mandates to avoid penalties and operational disruptions.1Cybersecurity Compliance for Smart Buildings: Navigating NIS2, NIST, and DoD Standards - Veridify Security
Background
Building systems have increasingly integrated digital and operational technologies in recent years, broadening the cyber attack surface. Many legacy Building Management Systems (BMS) continue to use protocols such as BACnet and Modbus that lack encryption and authentication, leaving networks exposed. Claroty reports that 75% of organizations operate BMS devices with known, exploited vulnerabilities. Recent findings highlight that outdated software, default credentials, and poor network segmentation often make corporate networks vulnerable through smart building systems.2Your smart building isn't so smart without security - Help Net Security Regulators and standards organizations have begun issuing cybersecurity frameworks tailored to this sector. The EU's Cyber Resilience Act (CRA), adopted in late 2024 and effective from December 2027, will set horizontal cybersecurity requirements for all products with digital elements, including IoT and smart building components.3Cyber Resilience Act
Details
In the U.S., the updated NIST Cybersecurity Framework (CSF) 2.0, released in 2024, broadens its focus to include cyber-physical and operational technology such as building systems. The framework prescribes zero trust architecture, device identity management, encryption, risk assessments, and continuous monitoring. It also introduces a governance function for strategic and policy oversight.1Cybersecurity Compliance for Smart Buildings: Navigating NIS2, NIST, and DoD Standards - Veridify Security NIST's current work with the Coalition for Smarter Buildings (C4SB) is developing the Digital Building Profile, which includes a cybersecurity working group. This group is preparing application profiles for various building types, leveraging standards such as NIST CSF, NIST Risk Management Framework (RMF), and ISA/IEC 62443, to promote interoperable, secure building infrastructure.4Cybersecurity for Building Systems | NIST
Beyond compliance frameworks, technical standards are progressing. The European IoT security standard EN 17927 (SESIP), launched in 2023, offers a methodology for evaluating IoT platform components through assurance levels to strengthen supply chain security.5EN 17927 The IoT Security Foundation's Smart Built Environment Working Group is developing comprehensive guidelines for secure specification, procurement, integration, operation, and maintenance of IoT in audiovisual (AV), fire, HVAC, lighting, and security systems.6Smart Buildings - IoT Security Foundation
Outlook
Industry stakeholders are expected to advance interoperable security frameworks and supply chain controls. NIST's C4SB cybersecurity profiles will likely influence secure deployment practices, while CRA enforcement after December 2027 will reinforce secure-by-design principles for digital building products. As regulators, standards bodies, and integrators coordinate security expectations, the resilience of smart building infrastructure is projected to improve measurably.
