M0818: Validate Program Inputs
Devices and programs designed to interact with control system parameters should validate the format and content of all user inputs and actions to ensure the values are within intended operational ranges. These values should be evaluated and further enforced through the program logic running on the field controller. If a problematic or invalid input is identified, the programs should either utilize a predetermined safe value or enter a known safe state, while also logging or alerting on the event.[1]
Analyst context for executives and security teams
Validate Program Inputs is an ICS mitigation focused on preventing unsafe or unauthorized values from being accepted by control-system devices and programs. For business leaders, the practical issue is operational safety and resilience: if a controller accepts a bad parameter or command without range, format, and logic checks, a process can be pushed outside intended operating conditions. The mitigation matters most where engineering workstations, HMI functions, PLC logic, or other control programs can influence field behavior.
Executive priority
Treat this as an engineering control and assurance priority, not only a SOC rule. Leaders should ask whether critical control logic enforces allowed values, safe defaults, and known safe states at the field-controller level, and whether invalid input events create auditable evidence. This supports resilience, cyber-physical risk reduction, and compliance alignment with the listed IEC 62443 and NIST SP 800-53 SI-10 references.
Technical view
SOC, IR, and OT engineering teams should validate that control-system programs check both format and content of user inputs and actions, enforce intended operational ranges in controller logic, and log or alert when invalid inputs occur. Relationship context indicates this mitigation is relevant to Modify Parameter (T0836) and Command Message (T1692.001), so testing should focus on whether parameter changes and command messages can drive devices outside defined process limits or without expected logical preconditions.
Likely telemetry
- Controller or device logs showing rejected, substituted, or out-of-range values
- HMI, engineering workstation, or application logs for user input and command attempts
- Alerts generated when invalid inputs are identified
- Change records for control logic, parameter limits, and safe-state behavior
- Process historian or operational data showing values near or outside intended ranges
Detection direction
- ATT&CK provides no official detection text for this mitigation, so coverage must be validated locally through engineering review and controlled testing.
- Confirm whether invalid inputs are observable in logs or alerts; if they are silently corrected or ignored, SOC and IR teams may lack useful evidence.
- Tune monitoring around abnormal parameter modifications and command messages, while accounting for legitimate maintenance, commissioning, and operator actions that may produce similar events.
- Correlate input validation alerts with change-management records and operational context before escalating as suspicious.
Mitigation priorities
- Define approved formats, ranges, and logical preconditions for control-system inputs and actions.
- Enforce those limits in the program logic running on the field controller, not only in upstream interfaces.
- For invalid or problematic inputs, use predetermined safe values or transition to a known safe state where appropriate.
- Generate logs or alerts for invalid input events so engineering, SOC, and incident response teams can review them.
- Maintain compliance evidence mapping validation behavior to IEC 62443 SR/CR 3.5, SR/CR 3.6, and NIST SP 800-53 SI-10 where applicable.
Analyst notes and limits
This object is a mitigation in the ICS ATT&CK domain. Its value is strongest when OT engineering, safety, SOC, and compliance teams jointly define what constitutes an allowed value, an unsafe value, and sufficient audit evidence. The relationship to Modify Parameter and Command Message highlights the need to validate both stored/configured values and operational instructions.
Platforms, tactics, and official detection guidance are not specified in the supplied ATT&CK fields. This take does not infer vendor behavior, active exploitation, or existing detection coverage. Local controller capabilities, process design, safety requirements, and logging architecture determine implementation and monitoring feasibility.
Validate Program Inputs
Devices and programs designed to interact with control system parameters should validate the format and content of all user inputs and actions to ensure the values are within intended operational ranges. These values should be evaluated and further enforced through the program logic running on the field controller. If a problematic or invalid input is identified, the programs should either utilize a predetermined safe value or enter a known safe state, while also logging or alerting on the event.[1]
How security teams should use this page
Treat this object as behavior context, not an attribution claim. Validate the related groups, software, data sources, and mitigations against official ATT&CK relationships and your own telemetry before making control-coverage decisions.
Techniques used
This mirrors the MITRE pattern of making group, software, campaign, and technique relationships scannable. Relationship notes come from mirrored ATT&CK relationship text when available.
| Domain | ID | Name | Relationship / procedure |
|---|---|---|---|
| ICS | T1692.001 | Command Message Sub-technique | Devices and programs that receive command messages from remote systems (e.g., control servers) should verify those commands before taking any actions on them. |
| ICS | T0836 | Modify Parameter | Devices and programs should validate the content of any remote parameter changes, including those from HMIs, control servers, or engineering workstations.CitationPLCTop20 Mar 2023 |
All related ATT&CK context
Object version and sync metadata
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Imported snapshots across ATT&CK releases (1)
| Release | Bundle imported | Object version | Modified | Status | Raw hash |
|---|---|---|---|---|---|
| 19.1 | 1.0 | Current bundle | 6cf686bdcc61… |
Mirrored ATT&CK source object
The raw object is retained through the mirrored ATT&CK source bundle and object hash. The raw endpoint returns the exact object from the mirrored bundle when available.
External references and citations
MITRE external references are preserved separately from Glexia analysis so citations remain traceable to their original source records.
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[1]
PLCTop20 Mar 2023
PLC Security, Top 20 Community. (2021, June 15). Secure PLC Coding Practices: Top 20 version 1.0. Retrieved March 22, 2023.
Open source URL -
[2]
mitre-attack M0818Open source URL
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