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The Radio Access Network (RAN) is the part of a mobile network that connects user devices to the core network. As enterprises and telecom operators adopt 5G, the RAN is becoming more important—and its security requirements are becoming more complex.
For private 5G deployments, securing the radio access layer is particularly important because industrial devices, IoT systems, applications, and operational environments may depend on the network for critical connectivity.
5G RAN security focuses on protecting this access layer from unauthorized access, data exposure, service disruption, configuration weaknesses, and other threats.
For organizations operating private networks, private 5G RAN security should therefore be treated as an important part of the overall network security strategy.
5G RAN security is the set of technologies, controls, testing practices, and processes used to protect the 5G Radio Access Network and the communication between user equipment and the network.
It covers areas such as:
In a private deployment, private RAN security extends these principles to enterprise-specific environments where RAN infrastructure may connect industrial devices, IoT platforms, edge systems, and business applications.
The RAN acts as a critical access point between devices and the network core. Weaknesses at the radio edge can potentially affect subscriber privacy, service availability, and network stability.
A strong 5G radio access network security strategy helps organizations:
Matrix Shell describes RAN as a critical access gateway and provides testing across 2G, 3G, 4G, 5G, VoLTE, VoWiFi, and Open RAN deployments.
The RAN attack surface extends beyond the physical base station.
Security teams should consider:
This makes the 5G radio security assessment an important part of a broader telecom security program.
A 5G base station, commonly represented by the gNB, plays a central role in connecting devices to the network.
5G base station security should address:
Security teams should verify that security controls are actually implemented and enforced rather than assuming they are secure because they are part of a modern 5G deployment.
gNB security is particularly important because the gNB sits at the boundary between wireless users and the wider network.
An assessment should consider:
In private 5G environments, gNB security should also consider the types of devices connecting to the network and the sensitivity of the workloads they support.
A RAN vulnerability assessment identifies security weaknesses across RAN infrastructure, configurations, interfaces, software, and associated components.
The assessment may include:
The objective is to establish where weaknesses exist and understand their potential effect on network operations.
RAN penetration testing goes beyond identifying potential weaknesses by using controlled security techniques to validate whether vulnerabilities can actually be exploited within an authorized testing environment.
Depending on the deployment, testing may examine:
Penetration testing should be carefully scoped to avoid disruption to live network services.
Common private 5G RAN vulnerabilities can include:
The actual risks depend on the architecture, configuration, technology suppliers, deployment model, and connected systems.
Open RAN introduces a more disaggregated approach to RAN architecture, with multiple components and interfaces potentially supplied or managed separately.
Open RAN security therefore requires attention to:
O-RAN security should not be treated as a completely separate security discipline. Instead, organizations should assess the additional interfaces and integration points created by the architecture.
Matrix Shell specifically includes Open RAN deployments within its RAN security testing scope and highlights the need to validate security across disaggregated RAN components.
RAN cybersecurity should include both technical controls and operational practices.
A practical assessment should validate:
Can only authorized devices and network components establish appropriate connections?
Is data transmitted over the radio interface adequately protected against unauthorized observation?
Can signaling and user traffic be modified without detection?
Are routing and traffic-management rules correctly configured and enforced?
Are unnecessary services, interfaces, privileges, and insecure settings removed or restricted?
Are administrative interfaces protected against unauthorized access?
Matrix Shell's RAN testing methodology specifically validates authentication, encryption, integrity protection, and traffic policies against telecom security requirements and GSMA guidance.
A structured 5G RAN testing process can follow:
Discover → Assess → Test → Remediate → Retest
Map RAN architecture, gNBs, interfaces, devices, management systems, and connections to the Core.
Review configurations, authentication, encryption, integrity, access controls, and traffic policies.
Perform controlled security testing and vulnerability validation.
Address identified weaknesses based on risk and operational impact.
Validate that remediation has actually resolved the identified issue.
For environments requiring deeper laboratory validation, Matrix Shell's 5G Security Lab provides controlled telecom testing capabilities and supports protocol, interface, configuration, and vulnerability testing.
Organizations deploying private 5G should consider these private 5G RAN security best practices:
The RAN is one of the most important security layers in a 5G network because it provides the connection between devices and the network core.
A comprehensive 5G RAN security strategy should therefore go beyond basic configuration checks. It should combine architecture review, vulnerability assessment, controlled penetration testing, authentication validation, encryption checks, integrity testing, traffic-policy assessment, and ongoing security validation.
For private networks, private 5G RAN security becomes even more important when the RAN connects critical IoT, industrial, edge, and enterprise systems.
Whether an organization operates traditional 5G RAN, private RAN, Open RAN, or a multi-generation environment, security teams should continuously validate the radio access layer rather than treating it as a trusted boundary.
