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10/07/2026 9:16 pm
TL;DR: Blast radius is the amount of damage an attacker can cause after the first foothold, and Zero Networks argues that lateral movement, standing privilege, and weak segmentation determine whether an incident stays local or becomes enterprise-wide. That makes containment, not only detection, a governance problem for NHI, IAM, and privileged access programmes.
NHIMG editorial — based on content published by Zero Networks: What Is Blast Radius in Cybersecurity? 5 Best Practices for Breach Containment and Attack Surface Reduction
By the numbers:
- A single compromised system can reach up to 85% of the environment in one hop, effectively exposing 100% of the network within two hops.
- Over 70% of threat activity runs through just four privileged management protocols that serve as high-trust highways for IT operations.
- 72% of organisations have experienced or suspect they have experienced a breach of non-human identities, 46% confirmed and 26% suspected.
Questions worth separating out
Q: What breaks when organisations do not constrain blast radius?
A: When blast radius is unconstrained, a single foothold can spread through internal trust, discover credentials, and reach critical systems before detection or response can contain it.
Q: Why do service accounts and privileged users increase blast radius risk?
A: Service accounts and privileged users increase blast radius risk because they often carry broad, persistent access into multiple systems.
Q: How do security teams know whether containment controls are actually working?
A: Containment controls are working when a low-value compromise cannot reach high-value assets, cannot move laterally through open paths, and cannot maintain elevated access without task-specific approval.
Practitioner guidance
- Map internal reachability from every identity Build a reachability model for users, service accounts, privileged admins, and third-party access so you can see where lateral movement is actually possible.
- Remove always-on privileged paths Identify persistent admin and high-risk access that does not need to remain active outside a task window, then replace it with time-bound elevation.
- Enforce identity-based segmentation Make policy follow identity through the network so a stolen credential cannot pivot through implicit east-west trust into critical systems.
What's in the full article
Zero Networks' full guide covers the operational detail this post intentionally leaves for the source:
- A step-by-step approach to quantifying blast radius across identities, endpoints, and internal communications.
- Operational guidance for closed-by-default segmentation and where identity-based microsegmentation fits.
- Examples of JIT MFA use for privileged access across OT, IoT, databases, and legacy systems.
- A practical breakdown of how deterministic automation can maintain policy without manual drift.
👉 Read Zero Networks' guide on blast radius containment and attack surface reduction →
Blast radius and lateral movement: are your controls keeping up?
Explore further
10/07/2026 9:39 pm
Blast radius is an identity governance problem, not just a network design problem. The article correctly shifts attention from initial compromise to post-entry movement, which is where many incidents become expensive. Identity policies determine how far stolen credentials, over-privileged service accounts, or misused admin access can travel. Practitioners should treat internal reachability as a governance metric, not only an architectural one.
A few things that frame the scale:
- 72% of organisations have experienced or suspect they have experienced a breach of non-human identities, 46% confirmed and 26% suspected, according to The 2024 ESG Report: Managing Non-Human Identities.
- Enterprises that have experienced a compromised NHI averaged 2.7 separate incidents in the past 12 months, according to The 2024 ESG Report: Managing Non-Human Identities.
A question worth separating out:
Q: Who is accountable when a breach expands because east-west traffic was left open?
A: Accountability sits with the teams that own identity policy, segmentation design, and privileged access governance. Frameworks such as NIST CSF and Zero Trust Architecture expect organisations to define and enforce boundaries, not assume internal traffic is safe by default.
👉 Read our full editorial: Blast radius containment is now a core identity governance issue
