SECS/GEM Command Protection
Command-level monitoring, detection, prevention, notification, and audit evidence for the SECS/GEM traffic that runs semiconductor fab equipment.
A network tap sees a connection to a tool. PacketViper sees the recipe.
Observe → Understand → Decide → Enforce → Notify
PacketViper sits inline between the host/MES and fab equipment, and evaluates SECS/GEM commands before they reach a tool. Routine data collection stays visible and permitted; an unauthorized recipe download or remote command can be blocked surgically.
Observe
See SECS/GEM activity on the wire: source, target tool, operation, and time.
Understand
Decode the operation and place it in context: which tool, which command, which source, what asset role.
Decide
Evaluate the command against policy: authorized source, protected operation, allowed rate.
Enforce
Permit routine data collection, and block unauthorized recipe downloads or remote commands inline, scoped to the command and tool.
Notify
Update dashboards, raise alerts, and record audit evidence for every relevant event as it happens.
When a command can load a recipe or halt a tool, the command becomes a control point.
Semiconductor fab equipment communicates with the host and manufacturing execution system using SECS/GEM over HSMS. Fabs run some of the most valuable and least forgiving processes in industry.
Like most industrial protocols, SECS/GEM was designed for reliable communication on a trusted network, not for authenticating the command. If a message reaches a tool and speaks the protocol, the tool obeys it. That means a process program (a recipe), a remote command that starts, stops, or pauses a tool, or an equipment constant change is honored the same way whether it came from the authorized host or from a system that does not belong on the line. A single unauthorized or tampered recipe can scrap a wafer lot and damage tooling, and much of the installed base of fab equipment cannot meet modern cybersecurity requirements on its own.
Routine data collection polls a tool. A recipe download or remote command changes what it does. To a network tap, both look the same.
SECS/GEM rides over HSMS. PacketViper treats the dangerous set – recipe downloads, remote commands, and equipment constant changes – as the primary security event.
A firewall can limit who reaches the host-to-tool link. Monitoring tools can alert after activity occurs. Those layers are useful, but they do not answer the command-level question fast enough:
Should this specific recipe download or remote command, from this source, to this tool, be allowed right now?
Four integrated functions at command level
Monitoring
Full visibility into SECS/GEM activity: source, target tool, operation, time, and action taken.
Detection
Real-time identification of policy-violating operations: unauthorized recipe downloads, unauthorized remote commands, and unauthorized equipment constant changes.
Prevention
Inline blocking of unauthorized commands at wire speed, scoped to the specific operation and tool rather than a blunt network shutdown.
Notification
Immediate dashboard updates, alerts, audit records, and operational evidence for every relevant event.
Deployed as a transparent inline bridge with no IP address on the protected wire path. No software installed on the tool, no changes to the host or MES. Routine data collection remains untouched; enforcement focuses on the dangerous set.
Recipe-source governance is the marquee control
You decide which sources may do each, per tool, at what rate. These are not separate products – they are policy dimensions inside one Secure Control Layer.
Process program (recipe) downloads
Decide which sources may download a recipe to a tool. An unauthorized or tampered recipe can scrap a wafer lot – this is the highest-value control on the page.
Remote commands
Govern start, stop, and pause commands. Only the authorized host issues control; everything else is unauthorized by definition.
Equipment constant changes
Govern changes to the parameters that define how a tool runs, scoped to approved sources.
Per-tool, per-source, per-rate
Policy is scoped to a single tool. A source that exceeds a normal command rate is throttled or blocked.
Advisory would-block
Show what would be blocked while still permitting traffic, so policy can be validated before prevention is activated on production tools.
Fail-open behavior
Allow traffic to pass if inspection is unavailable. Protection must never become the reason a tool stops.
An enforced compensating control aligned to SEMI E187 and E188
Because every governed command is recorded with its source, target, operation, and outcome, the audit trail is a byproduct of running the system.
PacketViper serves as an enforced compensating control aligned to the SEMI E187 and E188 cybersecurity requirements, protecting equipment that cannot meet those requirements natively and generating the evidence a fab needs to demonstrate control.
A recipe or remote command that should only happen from the right source, for the right reason
Recipe-source governance
Allow process program downloads only from the authorized host. Block them from any other source, so a compromised system on the line cannot load an unauthorized recipe.
Compromised host containment
Stop a compromised or unauthorized system from issuing start, stop, or pause commands to a tool even though it sits on the fab network.
Vendor and integrator access control
Allow equipment constant changes from approved sources only, log every change, and alert or block changes outside policy.
Compensating-control evidence
Generate the audit trail a fab needs to demonstrate SEMI E187/E188 alignment for equipment that cannot meet those requirements on its own.
Multi-tool, multi-fab consistency
Apply the same command-level discipline across many tools and, where a fab operates more than one facility, across sites.
Incident reconstruction
Command feeds, blocked operations, top senders, and audit data support rapid investigation after any flagged event.
PacketViper does not replace the host/MES, tool-level safety interlocks, or protocol security upgrades. It provides a compensating inline control layer for SECS/GEM command visibility, policy enforcement, and evidence.
Not a standalone bolt-on. A command-aware capability inside the platform.
A point solution might parse SECS/GEM traffic. PacketViper places the command inside operational context and enforces business policy at the moment a command becomes action.
- Asset Intelligence – associates SECS/GEM activity with known fab tools and roles
- Federation – distributes policy and visibility across tools and facilities
- AMTD & Deception – deny reconnaissance and create high-confidence triggers near protected assets
- Analytics & Compliance – turns commands, advisories, and blocks into reporting and audit evidence
Observe → Detect → Prevent
Enable monitoring on selected tools. Immediate visibility, no blocking.
Review the command feed and top senders. Normal host behavior becomes clear.
Define authorized sources for recipe downloads, remote commands, and equipment constant changes.
Run would-block reporting before enforcement. Catch policy mistakes safely.
Activate prevention on high-value tools first.
Extend policy to additional tools and, where applicable, additional fabs.
Not “we see traffic.” We understand the command.
PacketViper integrates SECS/GEM command-level monitoring, detection, prevention, notification, and audit evidence directly into a broader inline Secure Control Layer.
Beyond asset visibility
Adds command visibility: who attempted what operation, against which tool.
Beyond threat detection
Adds command prevention: an unauthorized recipe or remote command can be blocked inline, before it reaches the tool.
Beyond network segmentation
The connection is not the policy. The command, source, tool, and operation are the policy.
Beyond SIEM alerting
Adds pre-impact enforcement and sends cleaner evidence downstream.
Beyond standalone SECS/GEM monitoring
Adds the broader platform: AMTD, deception, federation, asset intelligence, analytics, and compliance.
One layer of AMTD, one appliance
SECS/GEM command control runs on the same single PacketViper appliance that delivers deception, sensors, and asset discovery across the rest of the industrial protocol landscape.
SECS/GEM Command Protection – common questions
No. PacketViper is agentless and inline. Nothing is installed on the tool, the host, or the MES.
No. It starts in observation mode so it never disrupts a running process, then narrows to surgical enforcement on the operations that carry risk. The capture path is fail open, so protection never becomes the reason a tool stops.
PacketViper governs the operation and the source: which systems may download a recipe, issue a remote command, or change an equipment constant to a given tool, and at what rate. It does not require reading or modifying recipe content to enforce that governance.
PacketViper serves as an enforced compensating control aligned to the SEMI E187 and E188 cybersecurity requirements, protecting equipment that cannot meet those requirements natively and generating the audit evidence a fab needs to demonstrate control.
Yes. Policy is authored once and applied consistently across every tool it covers, and extends to additional fabs as you scale.
No. PacketViper provides a compensating inline control layer at the command level, especially where legacy tools, vendor constraints, or operational realities make protocol upgrades difficult or incomplete.
Because the feature observes a command, understands its context, decides whether it matches policy, enforces the decision inline, notifies operators, and produces evidence. That is the Secure Control Layer in action.
Protect the recipes and commands that run your fab.
Start in Monitor mode for immediate visibility, then enforce on your highest-value tools. Book a demo and we’ll show command-level control against real SECS/GEM traffic.