External penetration testing

A controlled offensive assessment of the public technical attack surface: servers, services, remote access, exposed interfaces and Internet-facing infrastructure.

Context

External penetration testing answers a practical question: what could an attacker realistically do from the Internet against the organization’s public assets?

Unlike web penetration testing focused on an application and OWASP scenarios, this service covers technical exposure: IP addresses, domain names, reachable services, administration interfaces, VPN gateways, mail exposure, certificates, weak configurations and network exploitation paths.

The goal is to qualify exploitable risks without disrupting production: discovery, enumeration, controlled validation, evidence, prioritization and concrete exposure-reduction guidance.

Designed for Internet-exposed assets

SMEs, mid-sized organizations and local authorities

Obtain a clear view of the public attack surface and the risks reachable from the Internet.

Infrastructure teams

Review published services, remote access, network configurations and technical exploitation paths.

Management and CISOs

Prioritize fixes that actually reduce the likelihood of an external compromise.

Framed testing to measure real exposure

Scoping and rules of engagement

IP ranges, domains, exclusions, test windows, escalation contacts, exploitation limits and production constraints are agreed before testing starts.

External mapping

Identify exposed assets: DNS, IP addresses, ports, services, certificates, technologies, administration interfaces and public dependencies.

Technical enumeration and analysis

Search for vulnerable versions, weak configurations, unnecessary services, hardening gaps, exposed authentication mechanisms and information leaks.

Controlled validation

When relevant and authorized, scenarios are validated safely to confirm exploitability and measure impact without destabilizing systems.

Methodology focused on infrastructure and Internet exposure

  • PTES to structure reconnaissance, analysis and validation phases
  • NIST SP 800-115 for the methodological frame of technical security testing
  • ANSSI guidance and attack-surface reduction practices
  • CIS Benchmarks and vendor recommendations when they match the target technologies

Deliverables designed to reduce the attack surface

Exposure view

Summary of public assets, sensitive services, risky interfaces and elements that should be corrected or removed from the Internet.

Prioritized findings

Vulnerabilities, misconfigurations and exploitation risks ranked by impact, exposure and ease of exploitation.

Technical evidence

Reproducible elements, useful screenshots, commands or observations needed to understand and fix each finding.

Risk-reduction plan

Concrete recommendations: service closure, hardening, filtering, version fixes, monitoring and follow-up organization.

Turning findings into concrete hardening

Critical exposure found

A focused retest can quickly verify that the priority exploitation paths have been closed.

Complex attack surface

A configuration or architecture audit can complement the test to address structural causes of exposure.

Continuous maturity

A recurring review of the external surface helps detect newly exposed services and hardening regressions.