Overly Open Network Security Group Rules
Network security groups are a common place where gaps appear. NSGs are often updated quickly to solve access problems, but rules are not always reviewed later. Over time, organizations may accumulate broad inbound rules, overly permissive source ranges, exposed management ports, or rules that no longer match current workload needs.
A review should check whether NSG rules are specific, necessary, and tied to a documented purpose. Rules allowing broad inbound access from the internet should receive special attention. Management access such as RDP, SSH, or administrative application ports should be tightly controlled and monitored.
Good NSG management is not only about blocking traffic. It is about creating a clear access model that teams can understand and maintain. Rules should support the workload without leaving unnecessary paths open.
Public Endpoints That Should Be Private
Another common gap is unnecessary public exposure. Some Azure services are created with public network access or public endpoints because it is convenient during deployment. Later, those settings may remain even after the workload moves into production.
Public access is not always wrong. Some applications are designed to be internet-facing. The issue is when public exposure is not intentional, not protected, or not monitored. Storage accounts, databases, application services, and management endpoints should be reviewed to determine whether private access options are more appropriate.
Private endpoints and private connectivity patterns can help reduce exposure for many workloads. However, they should be designed carefully so DNS, routing, support access, and operations continue to work correctly.
Weak Network Segmentation
Network segmentation helps limit the impact of misconfiguration or compromise. Without segmentation, workloads may have more access to each other than needed. Development, test, production, shared services, and management networks should not always share the same level of trust.
A practical review should look at virtual network design, subnet structure, peering, route tables, firewall placement, and workload communication paths. The goal is to understand which systems need to communicate and which paths should be restricted.
Segmentation does not need to become overly complex. For many organizations, practical separation of production, non-production, management, and shared services is a strong starting point. The model should be understandable enough for teams to operate safely.
Routing That Is Not Well Understood
Route tables, forced tunneling, firewall routing, VPN connections, and ExpressRoute paths can become difficult to manage if they are not documented. A small routing change can affect application connectivity, monitoring, security inspection, or hybrid access.
Organizations should review whether traffic flows through the intended security controls. For example, traffic that should be inspected by Azure Firewall or a network virtual appliance should not bypass those controls because of an inconsistent route table or peering configuration.
A network review should document expected traffic paths, identify asymmetric routing risks, and confirm whether routing supports both security and reliability requirements.
Firewall Controls Without Clear Policy Ownership
Azure Firewall and other network security tools are useful only when policies are maintained. Firewall rules need owners, review cycles, naming standards, and a process for removing temporary access. Without this discipline, firewall policy can become difficult to understand and risky to change.
Rules should be reviewed for source, destination, protocol, port, application need, environment, and owner. Temporary rules should have expiration dates or review reminders. High-risk access should require additional approval and documentation.
BI Cloud Tech’s security deployments services can help organizations implement or improve network security controls in a careful, practical way.
Missing Network Logging and Alerting
Network security also depends on visibility. If network logs, firewall logs, NSG flow logs, DNS logs, and security alerts are not collected or reviewed, teams may not be able to investigate unusual activity or validate access patterns.
The goal is not to collect every possible log without purpose. The goal is to collect the right logs for security, operations, and troubleshooting. Logging should support useful detection and investigation, not just generate data.
Organizations using Microsoft Sentinel or a security operations process should confirm that network logs support the detections and investigations they expect. BI Cloud Tech’s cloud security assessment can help review these areas together.
Common Areas to Review
- NSG rules: Identify overly broad inbound and outbound rules.
- Public exposure: Review public IPs, public service endpoints, and management access.
- Private access: Evaluate where private endpoints or private connectivity should be used.
- Segmentation: Separate production, non-production, management, and shared services where appropriate.
- Routing: Confirm traffic flows through intended security controls.
- Firewall policies: Review rule ownership, temporary access, and high-risk exceptions.
- Hybrid connectivity: Validate VPN, ExpressRoute, and routing design.
- Logging: Confirm network logs support detection, investigation, and operations.
Recommended Next Step
Azure network security gaps often come from small changes that are not reviewed later. A structured review can help identify unnecessary exposure, routing complexity, weak segmentation, and missing visibility.
BI Cloud Tech can help assess Azure networking, connectivity, security controls, and remediation priorities. To begin, request an assessment.