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1Clear out junk files and repair common Windows errors2Scan for outdated or missing drivers - takes under a minute3Repair Windows errors before they cause bigger problemsOn October 10, 2023, CISA, the FBI, NSA, and the U.S. Department of the Treasury published guidance on managing open-source software (OSS) risk in operational technology (OT) and industrial control systems (ICS). Its central message: secure OSS across the supply chain, but evaluate updates and controls against the safety, reliability, and operating needs of the physical process.
What the government released
The publication, Improving Security of Open Source Software in Operational Technology (OT) and Industrial Control Systems (ICS), was issued through the Joint Cyber Defense Collaborative. CISA says it is intended for senior leadership and operations personnel at OT/ICS vendors and critical-infrastructure entities. It addresses OSS risk in OT products, including software-supply-chain risk, and aims to increase resilience.
The guidance is relevant to more than factory control systems. NIST uses OT to describe programmable systems or devices that monitor or control physical processes and environments. Examples include ICS, supervisory control and data acquisition (SCADA), distributed-control systems, programmable logic controllers, building automation, transportation systems, physical-access control, and environmental monitoring.
These systems can affect safety, production, the environment, and continuity of essential services. Their security decisions therefore cannot be made as if they were ordinary office IT: an update or configuration change that is routine on a business network may disrupt a physical process if it is not validated for the equipment and operating conditions involved.
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- Industrial Cybersecurity: Efficiently monitor the cybersecurity posture of your ICS environment, 2nd Edition
- ABIS BOOK
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Why open-source risk needs an OT-specific approach
Open-source components can be part of products and systems maintained by multiple organizations. A maintainer may publish a fix, a vendor may need to incorporate it into a product, an integrator may deploy that product in a particular control environment, and an asset owner must decide when and how to change a running system. If responsibility or component visibility is missing at any handoff, a known vulnerability can remain difficult to assess or remediate.
OT environments also increasingly use standard IT operating systems, IP networks, Ethernet, wireless links, and remote access. That connectivity brings operational benefits but reduces the separation older proprietary systems sometimes had. NIST’s Guide to Operational Technology (OT) Security, SP 800-82r3, notes the need to account for OT requirements when applying security measures. It cautions against assuming that IT tools or practices can be transferred unchanged to systems with distinct performance, reliability, and safety needs.
NIST summarizes the purpose of SP 800-82r3 this way: “This document provides guidance for establishing secure operational technology (OT) while addressing OT’s unique performance, reliability, and safety requirements.”
Who should own each part of OSS risk?
The fact sheet treats OSS security as a shared supply-chain responsibility rather than a task that belongs only to the plant operator or the software maintainer. The parties should coordinate so that vulnerability information, product fixes, and operational consequences are considered together.
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| Party | Practical responsibility |
|---|---|
| OSS maintainers | Maintain component information and coordinate vulnerability disclosure and fixes with affected users and suppliers. |
| OT/ICS product vendors | Know which OSS components are included in products, assess reported vulnerabilities, and communicate fixes and product-specific risks. |
| System integrators | Track the components and versions used in deployed configurations and evaluate proposed changes against the integration and process context. |
| Asset owners and operators | Maintain visibility into deployed systems, assess operational and safety impacts, and plan testing, maintenance, and recovery before applying changes. |
What organizations should put in place
Inventory components and preserve provenance
Maintain an inventory of OSS components used in products and deployed OT systems, including enough version and origin information to identify affected assets when a vulnerability is reported. Machine-readable software bills of materials (SBOMs) can support this work where feasible. An inventory is useful only if someone keeps it current and can connect its component records to actual products, configurations, and operating sites.
Track vulnerabilities and coordinate disclosure
Use recognized vulnerability identifiers and established disclosure practices so that maintainers, vendors, integrators, and operators can refer to the same issue. The CISA fact sheet points to National Vulnerability Database (NVD) and Common Vulnerabilities and Exposures (CVE) practices, as well as the OpenSSF Open Source Vulnerability (OSV) schema, as examples. A vulnerability record is a starting point for assessment, not by itself a determination that a particular OT installation is exposed or that a patch is safe to deploy.
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Plan fixes around process risk
Coordinate response among component maintainers, product vendors, integrators, and infrastructure operators. A fix may need to be evaluated for the affected product, system configuration, and physical process—not just for the component in isolation. Establish who will assess the issue, communicate exposure and remediation options, and approve an operational change.
Use defense in depth
Inventory and patching are not substitutes for layered security. NIST SP 800-82r3 and its OT control overlay provide an implementation framework that includes risk-based assessment and controls such as network segmentation and separation, least privilege, secure remote access, monitoring, backups, and incident-response preparation. Select and tailor controls to the system’s risk and operating requirements rather than treating the guide as a checklist.
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A vulnerability may warrant prompt action, but “prompt” does not mean deploying an untested change directly to a production control system. The organization needs a response path that weighs exposure against the consequences of changing or interrupting the process.
- Identify affected assets. Use the component inventory and product or system records to determine which products, versions, and sites may include the vulnerable component. Ask the vendor or integrator to clarify applicability when the inventory alone is insufficient.
- Assess the actual risk. Determine whether the vulnerable code is present and relevant in the deployed configuration, what access or operating conditions are required to exploit it, and what safety, availability, or process impacts could follow from exploitation.
- Choose a mitigation or update path. Work with the vendor and integrator to compare a patch with other available mitigations. Consider whether controls such as segmentation or restricting remote access can reduce exposure while a change is being evaluated.
- Test in a representative environment. Validate the update against a representative system or test environment before production deployment. Check compatibility and process behavior, not just whether the software installs successfully.
- Schedule and authorize deployment. Plan around approved maintenance windows and uptime constraints, with the appropriate operations and safety personnel involved. Define how the change will be monitored and who can approve proceeding or stopping.
- Prepare rollback and recovery. Confirm how to restore the previous known-good state and how to recover the system if the update causes an unexpected problem. Keep backups and incident-response arrangements usable for the affected environment.
- Verify and document the outcome. After deployment, confirm that the system is operating as intended, record the changed component and version, and update the inventory so future vulnerability assessments reflect the installed state.
How NIST SP 800-82r3 relates to the 2026 draft
NIST SP 800-82r3, Guide to Operational Technology (OT) Security, was published in September 2023. It provides OT-specific security guidance and an OT-tailored overlay of NIST SP 800-53 Rev. 5. It covers OT architectures, threats and vulnerabilities, segmentation and separation, application of the Cybersecurity Framework, and controls for low-, moderate-, and high-impact OT systems. NIST presents it as a risk-based guide, not a checklist.
NIST released an initial public draft of SP 800-82r4 on September 21, 2026. As of October 3, 2026, r3 remains the final published revision; r4 is a draft, and NIST is accepting comments through November 30, 2026.
| Document | Status as of October 3, 2026 | What it covers |
|---|---|---|
| NIST SP 800-82r3 | Final published revision; published September 2023 | OT security guidance, including OT architectures, threats, vulnerabilities, security controls, and a tailored SP 800-53 Rev. 5 overlay. |
| NIST SP 800-82r4 | Initial public draft released September 21, 2026; comments due November 30, 2026 | Proposed update that expands sector coverage, including building automation, water and wastewater, food and agriculture, freight rail, maritime, IIoT, and cloud convergence, and reorganizes around CSF 2.0. |
Organizations can follow the draft’s development, but should distinguish proposed material from the published baseline until NIST issues a final r4.
Where EO 14028 supply-chain guidance fits
NIST’s guidance on software supply-chain security under Executive Order 14028 provides related lifecycle and procurement context for federal agencies that acquire, deploy, use, and manage open-source and third-party software. It addresses open-source controls, SBOMs, enhanced vendor-risk assessments, and vulnerability management. It complements the OT-specific focus of SP 800-82r3: supply-chain practices can improve visibility and accountability, while OT security decisions still need to account for the physical system’s safety and operating constraints.
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