Text: David Brown, Senior Vice President International Business at FireMon
Reflecting Past Urgency Instead of Current Need
The most serious firewall issues do not arise from negligence. They stem from reasonable decisions made under pressure and then remain in effect long after the circumstances that justified the decisions have disappeared. Over time, the policies become a reflection of past urgency rather than current intent.
In this situation, 'misconfiguration' is a misleading term. It suggests a standalone error. What audits often reveal, however, is structural in nature: policies that are no longer aligned with the original purpose.
These deviations only become visible when you go looking for them. Temporary any-to-any patches become permanent. Shadow rules create the illusion of control, while actual access remains unchanged. Objects multiply, naming becomes inconsistent, the logic of rules clashes, and segmentation models may seem defensible on paper but do not hold up in live dependency patterns.
Compliance Gaps Often Show Something Else
For European organizations, firewall audits are increasingly part of a broader framework of accountability obligations. Regulators demand more than just the obligation to demonstrate that controls are in place. Organizations must also prove that these controls function effectively, consistently, and in a well-governed manner. Within the EU, for example, NIS2 and DORA impose higher requirements regarding operational discipline, continuous oversight, and demonstrating the functioning of controls.
In that context, recurring firewall issues of high severity are rarely 'just' compliance shortcomings. They usually indicate that policy management is no longer aligned with how the business operates today.
This is a recurring pattern where you see teams can describe the architectural intent (think about: where the boundaries should lie, which systems should communicate with each other, and which flows should not exist). But they fail to consistently demonstrate that the policies are actually applied, and that the intent is also reflected in data centers, cloud environments, and operating systems.
When that happens, audits reveal shortcomings whose risks are hard to ignore. However, hackers do not need an audit, and they will not wait for organizations to conduct one. All they need is a vulnerability.
Firewall policy often fails even before implementation, namely at the interpretation of it. A rule set may technically be correct, but still not represent a coherent access model, as it reflects years of exceptions and inherited decisions instead of what is needed now. When teams cannot confidently test the implications or validate dependencies reliably, change control becomes cautious and conservative, and the firewall becomes part of the infrastructure that cannot be modified.
The operational response is predictable. To avoid disruption, access is widened. Restructuring is postponed. Audits become an exercise in reconstruction rather than proof of stable governance.
Once policy management reaches that stage, a periodic evaluation may map the problem retrospectively, but it cannot restore control in a system that is constantly changing.
Continuous Validation is the Only Fair Answer
One-time audits do not provide a solution for this, as deviations are the result of daily changes. What is needed is a validation process that ensures that the policy remains aligned with objectives as the environment changes, and that risks are identified in a timely manner so that action can be taken.
Network Security Policy Management provides this when implemented as an operational practice rather than a reporting layer. It connects intentions, applied policies, and perceived dependencies, allowing teams to see where access has been extended beyond what is necessary, where segmentation has weakened, and where exceptions have quietly become the norm. Equally important is that this allows changes to be tested before implementation, replacing guesswork with facts.
And thus, firewall management transforms from occasional clean-up to continuous control.
What Does Policy Clarity Look Like in Practice?
The clarity of policies is reflected in the quality of decisions that teams can make under pressure. In a well-managed environment, firewall rules can be explained in terms of the current objective, rather than based on what has happened in the past. This does not require perfect documentation of every rule, but rather an access model that is explicit enough to properly assess change requests, keeping the discussion focused on what the service should be allowed to do, and whether the proposed change maintains that objective.
The principle of least privilege only becomes truly effective when the intent is clear, and control is a fixed part of the routine. Access rights can be assessed against a clear access model, and reviewers can validate the necessity and implications based on facts rather than feelings. Rationalizing the policy then becomes more than just an administrative task, as unnecessary and outdated policy elements are seen as sources of risks and operational impediments, rather than just unnecessary baggage.
Segmentation benefits from the same discipline. Boundaries hold up when they are continuously tested against actual dependency patterns and corrected before exceptions become the norm. Without that feedback loop, segmentation remains nothing more than a design diagram whose enforcement continues to erode.
All of this does not make IT environments simpler. It makes them manageable. Complexity may still be present, but it becomes visible, and the policy can be adjusted without relying on guesswork or accepting unnecessary risks as the price for stability.
The Question Audits Cannot Answer
When a finding of high severity is mentioned in an audit report, it is tempting to view it as a shortcoming that needs to be addressed. However, a more useful interpretation is that it points to a larger problem: can the organization confidently explain how the policy reflects the current intentions across the entire organization, and can it safely adjust that policy when business operations require it?
If not, the same shortcomings will continue to recur in different forms. The naming may change. The underlying cause does not.
