Identify exposed assets, reduce your attack surface, and uncover potential entry points through comprehensive perimeter assessments.
Adversary Simulation
External Attack Surface
Passive and Active Testing
Secured External Perimeter
Your external perimeter is often the first point of contact for adversaries seeking to infiltrate your organisation. Misconfigured systems, forgotten development environments, and exposed services can provide attackers with direct paths to internal networks.
SilentGrid's Perimeter Assessment identifies and maps Internet-facing assets across your organisation, uncovering weaknesses that could be exploited. Unlike automated vulnerability scanners, our approach is fundamentally manual and expert-driven. We think like real attackers, identifying vulnerabilities that automated tools miss – from custom-built applications to industry-specific exposures that depend on your unique processes and systems.
Our security researchers go beyond checking for known CVEs. We uncover logic flaws, business process vulnerabilities, and exposures in third-party software that hasn't been covered by mainstream security research. This human-led approach ensures that all external assets are accounted for and secured, minimising the risk of unintended exposure.
We are flexible in our approach – depending on the time allocated for the exercise and your budget, we can simulate either an opportunistic attacker looking for easy targets or a targeted attack against your organisation with specific objectives.
As organisations expand their digital presence across cloud platforms, third-party services, and global infrastructure, managing external assets becomes increasingly complex. Perimeter Assessments provide visibility into critical risks:
Development or test environments left online
Unmonitored systems spun up outside official processes
Forgotten or unpatched systems presenting vulnerabilities
Exposed integrations and cloud service misconfigurations
SilentGrid combines advanced reconnaissance techniques, threat intelligence, and active testing to provide a comprehensive view of your external attack surface. Our manual, expert-driven methodology mimics real determined attackers who think outside the box – not just running automated scans.
OSINT, DNS enumeration, and internet-wide scans to identify exposed assets without direct interaction
Probing for misconfigurations in public-facing services, web applications, and network devices
Detecting known vulnerabilities, outdated software, and misconfigured service implementations
Time-boxed validation of exploitability including credential stuffing and weak configurations
SilentGrid's perimeter assessment provides detailed, actionable intelligence to reduce external risk:
Full list of identified Internet-facing assets, subdomains, and third-party systems
Vulnerabilities ranked by severity, exploitability, and potential business impact
Visual mapping of external entry points, open ports, and exposed APIs
Clear, practical steps to harden exposed services and mitigate risk
Your external attack surface changes daily. New services are deployed, cloud resources are spun up, and forgotten systems remain exposed. SilentGrid offers continuous perimeter monitoring that goes far beyond automated scanning. This is not an automated vulnerability scanner. While we leverage tools to track the latest CVEs, our approach remains fundamentally manual and expert-driven. Our security researchers think like determined attackers, identifying vulnerabilities impossible to spot with automated tools – from obscure third-party software to organisation-specific exposures based on your processes, industry, and unique attack surface. The longer we spend assessing your perimeter, the deeper our understanding becomes, uncovering increasingly sophisticated attack vectors that automated tools will never find. Our continuous monitoring programme includes:
to identify new exposures and shadow IT
flexible frequency to catch emerging threats and misconfigurations
when critical exposures are detected
A perimeter assessment is often the first step in developing a resilient external security posture. The findings serve as the foundation for more targeted security efforts:
Full-scope adversary simulation to test your entire security ecosystem
Test internal defences once an external foothold is established
Test human defences against phishing and pretexting attacks
Focus on critical web applications to uncover application-level vulnerabilities
Unlike automated vulnerability scanners, SilentGrid's Perimeter Assessment is conducted by security researchers who think like real attackers. We identify vulnerabilities that automated tools simply cannot find.
Expert researchers who understand context, business logic, and industry-specific risks
Discover vulnerabilities in custom applications and obscure third-party software
Each assessment builds on previous findings, uncovering deeper attack vectors
Our team has extensive experience in discovering and securing external assets for organisations globally, establishing SilentGrid as a trusted partner in perimeter security.
Assessed perimeters across diverse industries and regions
Recognised leader in external security assessments
Seasoned professionals with offensive security backgrounds
Perimeter assessments are ideal for organisations that:
Discover and secure your external attack surface
Our expert team will help you identify exposed assets and reduce your organisation's external risk.
External Only
1-6 weeks
Asset Inventory & Risk Report
