Many organizations conduct compliance-driven penetration tests to satisfy regulatory requirements and prove that security controls are in place. These assessments follow a defined scope based on regulatory checklists. But in pursuit of this specificity, they often don’t test whether those controls actually prevent real attacks.
This gap creates a two-pronged vulnerability problem.
First, superficial compliance-only testing leaves you vulnerable to modern attack methods. Modern attackers exploit exactly what compliance testing often doesn’t catch. Second, and more immediately consequential, compliance-only testing leaves you susceptible to failing third-party assessments.
When customers, partners, or acquirers conduct their own security assessments, they test far more comprehensively than compliance requirements demand. They look for exploitable vulnerabilities, not just control existence.
Understanding this gap is the first step. But knowing it exists and proving it exists are two different things.
That’s why we interviewed one of Drummond’s security experts about penetration testing. After several years conducting security audits and penetration tests he has identified five recurring vulnerability patterns that compliance-driven testing systematically misses.
What makes these patterns critical is that third-party assessors often discover them quickly during due diligence. Each of the following case studies represents real world examples that are exactly the type of vulnerability which passes a compliance review but can fail a comprehensive third-party assessment.
Use these real-life scenarios to make your case internally. Show your organization what our security expert consistently finds and demonstrate why comprehensive testing isn’t optional when customer trust and deal valuations are on the line.
CASE STUDY 1: Shared Virtual Memory with Accessible Credentials
The Vulnerability
When multiple processes run under the same user account, they can access each other’s virtual memory. Credentials are often stored in that virtual memory alongside application data. Many aren’t aware how exploitable this is or how far attackers can go once they gain access.
What We Discovered
During one assessment, our security expert compromised an email application running under a shared user account. But that compromise opened more than email. Because the email process shared a user account with other applications on the server, it could access their virtual memory. Our security expert extracted those credentials and found plaintext access for the accounting system, database, and critical infrastructure tools.
Most people aren’t aware how critical segregating virtual memory is simply because shared virtual memory exploitation isn’t part of standard testing.
As our expert noted: “Segregating virtual memory into different user accounts is critical. So many system admins, developers, and security teams don’t realize how exposed they are when they don’t segregate their virtual memory.”
Many organizations miss this vulnerability simply because shared virtual memory exploitation isn’t part of standard compliance-based testing. And attackers count on this. Our penetration testing team finds it frequently. When a customer or partner reviews your infrastructure, it could become one of their first flagged concerns.
CASE STUDY 2: Open Outbound Firewalls
The Vulnerability
Organizations typically prioritize inbound firewalls, protecting against threats coming in. Often resulting in outbound firewalls becoming an afterthought. As a result, traffic coming in is restricted, while traffic going out is completely open.
What We Discovered
In a recent engagement, our security expert gained a small foothold on an internal server and immediately began contacting external infrastructure through unrestricted outbound ports. The organization’s inbound firewall was well configured. The outbound firewall didn’t exist. That single architectural gap transformed a limited foothold into a complete network compromise.
As our expert observed: “I’d say the majority of systems we test have an incoming firewall, but no outgoing firewall. This means someone could basically send out traffic on any port from the inside.”
This gap exists because compliance frameworks like HIPAA and SOC 2 don’t explicitly mandate outgoing firewalls. They’re not on the compliance checklist. Organizations skip them to save cost and complexity.
Security-savvy partners and customers know this. They look for outbound firewalls during every assessment. When they find the gap, it doesn’t just become a finding. It becomes proof that your compliance test missed a critical security component.
CASE STUDY 3: Overreliance on Automated Tools
The Vulnerability
Automated scanners look for known vulnerabilities. They’re excellent at finding documented signatures: missing patches, weak protocols, default credentials. But they have a fundamental limitation. They can only find vulnerabilities that have been previously documented. If a vulnerability doesn’t match a known pattern, the tool has difficulty catching it.
What We Discovered
Our security experts regularly find admin credentials stored in plain text in deployment scripts. Automated scanners can’t catch them because they’re looking for documented vulnerabilities, not sloppy practices. When a customer’s security team reviews your code during due diligence, they spot those credentials in minutes.
The same gap appears in infrastructure. Multiple applications on a single server often store database passwords and API keys in configuration files. Compromising one application opens access to all the others. One vulnerability becomes a highway across your entire infrastructure. Automated tools miss this because it’s an architectural design flaw, not a documented vulnerability.
According to our expert: “Automated tools find less than 1% of real vulnerabilities. They won’t catch application logic errors or custom systems. The tools have no way to flag multiple applications with shared permissions as a problem.”
This reveals the fundamental limit of automated scanning.
These tools validate that documented vulnerabilities don’t exist. They miss the practice-based mistakes and architectural decisions that attackers actively exploit. And when a customer or partner conducts their own assessment, those missed gaps become the findings that can derail deals.
CASE STUDY 4: Credential Reuse Across Systems
The Vulnerability
Credential reuse is the practice of using the same admin password across multiple systems and servers. The password is strong. It meets complexity requirements. But many organizations aren’t aware how this practice enables attackers to move laterally once they compromise a single system.
What We Discovered
During an assessment, our security expert gained initial access through a compromised web application. They found admin credentials in a script file on the server. They tested those credentials against other systems. And they worked, everywhere. The organization reused the same credentials across the email server, database server, backup systems, and critical infrastructure.
That single credential extraction escalated to complete domain administrative control across the entire network in under four hours. Our security expert moved from initial access on one system to systems they never should have had access to because the credential they found happened to be the master key to everything.
According to our expert: “Credential reuse is very, very often the problem when I compromise a client. Admin accounts using the same password across different servers or systems make lateral movement trivial.”
From a compliance perspective, each system has secure authentication. From a security perspective, credential reuse across systems means extracting a single credential from one system opens access to everything else running under that account.
Compliance frameworks don’t explicitly forbid this practice, which is precisely why hasty compliance testing can miss it. When a customer, partner, or acquirer conducts their own assessment, this vulnerability becomes one of their first discoveries.
CASE STUDY 5: Poor Server Hardening Behind Secure Web Applications
The Vulnerability
Organizations often invest heavily in securing their web applications but neglect the servers hosting them. They review application code. They implement proper authentication. They add access controls. But the underlying server isn’t patched. Unnecessary ports are open. And user privileges are excessive. This type of infrastructure is built on a dangerous assumption: the web application will never be compromised.
What We Discovered
During one assessment, our security expert exploited a vulnerability in a well-secured web application. The application itself was secure. But once inside the server, the picture changed entirely. The server wasn’t hardened as if the application might be compromised. It was hardened assuming the application would never be breached.
Our security expert found unpatched services running, unnecessary open ports, and excessive user privileges. And services were running with elevated permissions that should have been restricted. All of it existed because the security focus had been entirely on the application layer. The infrastructure layer assumed “the application won’t be breached.” When it was, every control at the server level collapsed.
For this reason, compliance testing only goes so far.
Compliance-based testing validates that your web application meets security standards. It does not comprehensively test what happens once you’re inside the server, or whether the underlying infrastructure is hardened assuming the application might be compromised.
Security-savvy assessors test the opposite assumption: they assume the application will be breached, then evaluate whether the server can contain that breach. When a customer or partner conducts their own assessment, this inconsistency becomes a critical finding.
The Structural Case for Comprehensive Testing
These five real-world vulnerabilities exist in compliant organizations because compliance testing was never designed to detect them.
The cost of discovering this gap is not theoretical. If you’re not proactive, you won’t find these vulnerabilities on your schedule. Instead, they will be identified when a customer walks into due diligence, when a partner’s security team reviews your infrastructure, when an acquirer questions your architecture, when a regulator expands their audit scope beyond the checklist, or when they are exploited.
When that happens, the pattern unfolds with depressing predictability.
If a vulnerability gets past your compliance review and an external party discovers it. Contract terms can be renegotiated or deals might collapse entirely. Partnerships require expensive remediation before proceeding. Three months of revenue disappears while you fix vulnerabilities your compliance-based pen testing failed to catch.
Drummond’s penetration testing is built on this reality. We validate your actual security posture, not just compliance status. We find what third parties will find. We expose what attackers will exploit. And we do it before your compliance credential becomes evidence of inadequate testing.