Offensive Security

Network Security Assessment

Internal and external network testing to expose exploitable exposure.

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What it is

An assessment of what your network actually exposes, internally and at the perimeter. We enumerate live hosts and services, find the forgotten and unpatched among them, test segmentation claims by trying to cross the boundaries, and show which exposed service becomes a foothold.

How we do it

  1. 1

    Asset discovery

    Full sweep of in-scope ranges to find the hosts your inventory has lost track of.

  2. 2

    Service fingerprinting

    Version identification across every open port, including services on non-standard ports.

  3. 3

    Vulnerability confirmation

    Scanner output validated by hand so you are not chasing findings that are not exploitable here.

  4. 4

    Segmentation testing

    We attempt to reach each network zone from each other zone and record what the firewall actually permits, not what the policy says.

  5. 5

    Exposed service exploitation

    Safe proof that an exposed service leads somewhere — default credentials, unauthenticated interfaces, legacy protocols.

  6. 6

    Lateral movement

    From one compromised host, how far does the network let us go?

What's included

  • Internal and external perspectives
  • Discovery of unmanaged and forgotten hosts
  • Segmentation verified by testing, not by config review
  • Manual validation of every scanner finding
  • Lateral movement paths mapped
  • Prioritised by exploitability, not CVSS alone

Who needs it

  • Organisations with flat or ageing internal networks
  • Teams with a segmentation claim they need evidenced for an auditor
  • Businesses after a merger, migration or office move

Deliverables

  • Live host and service inventory, including unmanaged assets
  • Segmentation matrix — what can reach what, in practice
  • Lateral movement path diagram
  • Patch and hardening priorities in fix order

Compliance relevance

PCI DSSISO 27001NIST CSFCIS Controls

Frequently asked questions

Discovery and fingerprinting are low-impact and we tune aggressiveness to your environment. Anything with genuine disruption potential — legacy SCADA, fragile appliances — is flagged and only tested with your written go-ahead.
No. Internal assessment normally runs from a device or virtual machine we ship or you deploy, connected to the segments in scope.
Scans list vulnerabilities. This tells you which ones an attacker can actually chain into access, and whether your segmentation stops them afterwards.
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