Yes, when the main issue is uncontrolled connectivity and spread risk. Zero Trust segmentation can deliver immediate value by reducing attack paths, improving visibility, and tightening policy around workloads. Teams should still review tool rationalisation, but a strong segmentation layer can lower risk sooner than a full technology overhaul and often works alongside existing controls.
Why Segmentation Usually Pays Off Before a Full Tool Replacement
zero trust segmentation is usually the faster first move when the organisation’s real problem is broad connectivity, weak workload isolation, or unclear east-west policy. It directly reduces reachable attack paths, limits lateral movement, and forces policy decisions closer to the assets being protected. That makes it a practical risk-reduction layer even when legacy tools stay in place for a while.
The key question is not whether the tool stack is modern enough, but whether current network and workload flows are already too permissive. If they are, segmentation creates immediate blast-radius reduction without waiting for a major platform migration. It also gives teams a clearer view of what actually talks to what, which is often the prerequisite for rationalising tools intelligently rather than by assumption. For a broader reference on the model, see NIST SP 800-207 Zero Trust Architecture and NHIMG’s Ultimate Guide to NHIs.
How Segmentation and Tool Rationalisation Fit Together
Tool replacement and segmentation solve different problems. Segmentation constrains reachability and enforces policy, while tool rationalisation reduces overlap, operational burden, and blind spots over time. If you try to replace tools first, you may spend months or quarters redesigning controls before you reduce the most urgent exposure. If you segment first, you often buy down risk while the larger remediation programme is still being planned.
That sequencing matters because many environments already contain enough defensive capability, just not enough control over connectivity. Existing firewalls, endpoint controls, identity controls, logging, and monitoring often become more effective once segmentation narrows the traffic and removes unnecessary trust relationships. In practice, the strongest sequencing is usually to stabilise traffic paths, then remove duplicated or obsolete tools with better evidence about what remains necessary.
For implementation guidance, NIST Cybersecurity Framework 2.0 supports prioritising risk reduction and control clarity, while CIS Controls v8 reinforces asset visibility, access control, and secure configuration as the foundation for reducing exposure.
Risk and Threat Considerations
When segmentation is delayed, organisations stay exposed to unrestricted lateral movement, weak trust boundaries, and discovery gaps that make compromise easier to spread. That risk is amplified where workloads, service accounts, or third-party connections have more reach than they need. NHIMG research shows that 90% of IT leaders say properly managing NHIs is essential for a successful zero-trust implementation, which is a strong signal that segmentation and identity-controlled connectivity are usually intertwined.
Failure mechanism: Flat or weakly segmented environments let an attacker or misconfigured workload reuse one foothold to reach many systems, often before monitoring or containment can react. Poorly scoped trust also hides which connections are legitimate, making policy cleanup and incident triage harder.
Impact: The practical consequence is larger blast radius, faster spread, and more expensive remediation. In environments with high secret sprawl or excessive privilege, segmentation can be one of the quickest ways to reduce the damage potential while longer-term tool consolidation is still underway.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
OWASP Non-Human Identity Top 10 address the attack and risk surface, while NIST Zero Trust (SP 800-207), NIST CSF 2.0 and CIS Controls v8 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST Zero Trust (SP 800-207) | 3 — Zero Trust Principles | Zero Trust segmentation is central to this architecture and its trust reduction model. |
| Recommendation — Apply zero trust principles to restrict lateral movement and enforce explicit policy between workloads. | ||
| NIST CSF 2.0 | PR.AC — Access Control | Segmentation is a concrete access-control measure that reduces unnecessary reachability. |
| PR.PT — Protective Technology | Segmentation is a protective technology used to contain spread risk and isolate assets. | |
| Recommendation — Constrain network and workload access to only approved communications paths. Deploy containment controls that limit compromise propagation across environments. | ||
| CIS Controls v8 | 4 — Secure Configuration of Enterprise Assets and Software | Segmentation depends on disciplined configuration of network and workload paths. |
| 6 — Access Control Management | The question is about prioritising a control that directly reduces access scope before tool overhaul. | |
| Recommendation — Harden and standardise network paths so only required flows remain enabled. Restrict access paths before rationalising overlapping security tooling. | ||
| OWASP Non-Human Identity Top 10 | NHI-02 — Secrets Sprawl and Exposure | Poorly controlled connectivity increases the blast radius when secrets or workload access are exposed. |
| Recommendation — Reduce exposed paths so leaked credentials cannot pivot broadly. | ||
Practitioner Guidance
What to prioritise: Start with the highest-risk east-west paths, not the loudest tooling debate. If a workload or segment can reach sensitive systems without a business need, constrain that path first and measure whether traffic and exception volume drop.
What to verify: Before calling the control effective, verify that the segmentation policy is based on observed dependency data rather than assumptions. The control should be able to show which flows were intentionally permitted, which were blocked, and which legacy rules are still carrying unexpected business traffic.
Practitioner takeaway: Replace tools when the architecture justifies it, but reduce reachability first when the main exposure is excessive connectivity, because blast-radius reduction delivers value sooner and makes later rationalisation more accurate.
Related resources from NHI Mgmt Group
- Should organisations prioritise Zero Trust for machine identities before broader IAM changes?
- Should organisations prioritise data security coverage for GenAI and MCP paths before expanding more legacy controls?
- How should organisations implement Zero Trust Architecture without trying to replace every control at once?
- How should organisations phase zero trust maturity without trying to replace everything at once?
Deepen Your Knowledge
Reviewed and updated by the NHIMG editorial team on September 20, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org
