SD-WAN Security Implications

Security Solutions

Cyber-attacks from hackers and state actors have become more prevalent in recent years, and businesses need their networks secure from outside threats. The security solutions of traditional WANs are difficult to manage because of the layers of underlying software being utilized through a non-friendly virtualization environment.

IPsec is an integrated solution for the SD packages that provide end-to-end encryption between locations. Most of the SD solutions that are offered on the market should ideally include IPsec and next-generation firewalls (NSFW) as part of the cyber defense package. However, they should not be the only things that organizations should rely upon in order to maintain a solid security profile.

5 Common Security Mistakes That Need to Be Addressed

SD-WANs are still relatively new and hasn’t been fully embraced by industries yet. The top issue that organizations demand to be addressed is security, as often insider threats and outside entities will find ways to compromise the network. Here are 5 of the common security mistakes that are encountered when executing a software-defined approach for your network and how to prevent them from happening to your organization:

Failure to Define and Implement the Correct SD-WAN Solution for Your Company’s Risk Profile

As stated before, the security features that are packaged with SD-WAN will not be sufficient enough against the vast scope of security threats that exist in today’s world. Additional measures that would need to be included as part of the SD package to cover network security requirements and threat management are secure gateway services, next-gen firewalls with built-in intrusion prevention, web filtering, anti-malware protection, and SSL inspection.

Common SD-WAN Security Misconfigurations and How to Prevent Them

Selecting an SD-WAN solution with security capabilities is only one part of protecting an enterprise network. Incorrect configurations, excessive access permissions, and inconsistent security policies across branch locations can create gaps that attackers may exploit.

Organizations should review the following configuration risks when deploying and operating SD-WAN infrastructure.

• Overly permissive firewall rules: Firewall rules that allow unnecessary traffic between network segments or branch locations can increase the potential impact of a compromised device. Apply least-privilege rules that permit only the traffic required for approved business applications.
• Exposed management interfaces: SD-WAN management systems and controller interfaces should not be unnecessarily accessible from the public internet or general user networks. Restrict administrative access to authorized management networks and approved access methods.
• Inconsistent branch security policies: Different firewall, access-control, and traffic-inspection policies across branch offices can leave some locations less protected than others. Use centrally governed policies where supported, and regularly verify that deployed configurations match approved security requirements.
• Weak administrative access controls: Shared administrator accounts, excessive privileges, and insufficient authentication controls can increase the risk of unauthorized configuration changes. Assign individual accounts, enforce multifactor authentication where supported, and grant permissions according to job responsibilities.
• Delayed firmware and software updates: Outdated SD-WAN software or network-device firmware can expose infrastructure to known vulnerabilities. Maintain an inventory of deployed components, monitor vendor security advisories, prioritize applicable patches, and verify updates after implementation.

How to Reduce SD-WAN Configuration Risks

IT teams should establish a documented configuration baseline before deployment and review it periodically. This baseline should cover firewall policies, management access, administrative privileges, software versions, logging, and approved communication paths.

Configuration changes should follow a controlled process that includes authorization, testing where appropriate, implementation records, and a rollback plan. Automated provisioning can improve consistency, but it should not replace security validation.

The objective is to ensure that every branch and management component follows the organization’s approved security policies throughout the SD-WAN lifecycle.

Cutting Corners in Security

Companies that try to go on the cheap by buying low-budget SD-WAN Deployment solutions will face the risk of limiting their capabilities to apply security policies correctly and in a consistent manner. Internet traffic consists of SSL-encrypted data, which makes up the bulk of the information traversing the internet. The immediate risk will be posed to your organization if your IT staff do not take proper measures to the proxy, decrypt, and enforce this type of traffic across the board. If a hacker manages to gain access into the network, they would potentially be able to move unhindered and compromise the enterprise and leave it exposed to data breaches and cyber attacks.

Falsely Assuming SD-WAN Eliminates the Need for WAN Resilience and Security Best Practices

SD-WANs will still need to be subject to rigorous security standards in the same fashion as traditional WANs. Just because they come with the latest and greatest in cloud computing technologies does not make companies exempt from taking responsibility for their own network security posture. You’ll need to have your teams continually monitor patching that’s applied to the network and keep it safe.

How Network Segmentation Reduces SD-WAN Security Risks

Network segmentation divides an enterprise network into separate security zones based on business purpose, sensitivity, and access requirements. In an SD-WAN environment, segmentation policies can help control communication between branch offices, corporate systems, guest networks, IoT devices, and sensitive applications.

Without appropriate segmentation and access controls, a compromised endpoint may communicate with systems beyond the device’s intended business scope. Segmentation can restrict those communication paths and help limit an incident’s potential impact.

Key SD-WAN Segmentation Practices

• Separate networks according to business function. Consider maintaining distinct security zones for employee devices, guest access, operational technology, IoT devices, and sensitive business systems. The exact design should reflect the organization’s architecture and risk assessment.
• Restrict traffic between segments. Define explicit rules for which applications, services, and destinations each segment can access. Avoid unrestricted communication between branches or internal networks unless required.
• Control access to critical applications. Only approved users, devices, and network zones should be able to reach sensitive systems. Apply additional authentication and access controls where appropriate.
• Review inter-segment policies regularly. Business requirements change as you add applications, locations, and devices. Review firewall rules and segmentation policies to identify unnecessary permissions and remove obsolete access.
• Monitor traffic across security boundaries. Centralized logging and appropriate network monitoring can help identify unexpected communication patterns, repeated access denials, and potential attempts to move between network segments.

Segmentation is most effective when combined with strong identity controls, endpoint security, firewall enforcement, and ongoing monitoring. It does not prevent every attack on its own, but it can reduce unnecessary connectivity and limit exposure when a device or network segment is compromised.

Not Having a Grounded Understanding of the Included SD-WAN Security Features and what’s Not Included:

It is absolutely necessary for clients to understand what security features are included with their SD-WAN solution, especially when trying to determine which solution is best for the company. Just like any other new piece of hardware, choosing the wrong one for your organization would have disastrous consequences, and expose it to risks.

Companies should conduct internal risk assessments of their networks and facilities before they commence with any form of SD-WAN migration.

One-click Deployment and Zero-Touch Provisioning

Clients will need to shy away from the attitude of the SD-WAN as simply ‘just working’ without requiring to configure network paths and routers beforehand. Adopting that kind of mindset would also expose your organization to risk. Businesses and enterprises will need to understand their connectivity paths, such as how data travels point A to point B, whose controls the paths they data is traversing through, and what happens to it while in transit.

Securing SD-WAN Controllers, Management Access, and Zero-Touch Provisioning

SD-WAN platforms simplify network management by allowing administrators to configure and monitor multiple locations through centralized management systems. Automated onboarding and zero-touch provisioning can reduce manual deployment work, but you must protect the management environment and device-onboarding process.

Compromising privileged management components can have consequences beyond a single branch because administrators may use those systems to manage policies and network devices across the enterprise.

Protect the SD-WAN Management Plane

Restrict access to SD-WAN management interfaces to authorized administrators and approved management networks. Avoid exposing administrative interfaces directly to the public internet. Where supported, use multifactor authentication, role-based access control, secure administrative workstations or jump hosts, and individual accounts.

Separate management traffic from ordinary user traffic wherever the platform and network architecture support it. Limit permitted connections to the ports, protocols, source addresses, and destinations required for legitimate administration.

Validate Devices During Zero-Touch Provisioning

Zero-touch provisioning automates the initial onboarding of network devices. However, automated deployment should not mean accepting unknown devices or unreviewed configurations.

Organizations should verify device identity and authorization through the platform’s supported onboarding mechanisms, protect provisioning credentials, and ensure that devices receive approved configuration templates and security policies.

Before a newly provisioned device carries production traffic, validate its identity, software version, management access controls, routing policies, and required security settings. Investigate unexpected onboarding attempts or devices that do not match the approved inventory.

Monitor Administrative Changes

Maintain records of administrator logins, configuration changes, policy updates, and device onboarding events. Send relevant logs to a protected central logging system where supported, and alert on unusual activity such as unexpected privilege changes or unauthorized configuration modifications.

Review vendor security advisories and apply relevant security updates within an established patch-management process. If suspicious management activity is detected, follow the organization’s incident-response procedures to investigate the event, preserve relevant evidence, and contain any confirmed compromise.

Secure management access and provisioning controls help reduce the risk of unauthorized changes across distributed SD-WAN infrastructure.

SD-WAN Security Audit Checklist for Enterprise IT Teams

SD-WAN security requires ongoing validation after deployment. A periodic security review helps IT teams confirm that network configurations, access controls, and operational procedures continue to meet organizational requirements.

Use this checklist as a starting point for an SD-WAN security review.

• Configuration management: Compare deployed configurations with approved security baselines and investigate unauthorized changes.
• Administrative access: Review administrator accounts, permissions, authentication controls, and access to management interfaces.
• Firewall policies: Remove unnecessary rules and confirm that permitted traffic aligns with documented business requirements.
• Network segmentation: Validate access restrictions between branch offices, guest networks, IoT devices, and sensitive systems.
• Encryption and authentication: Verify that supported security protocols and device-authentication mechanisms are configured according to vendor guidance.
• Software and firmware updates: Identify outdated components, review applicable security advisories, and track remediation.
• Logging and monitoring: Confirm that relevant events are recorded, retained appropriately, and reviewed for suspicious activity.
• Provisioning controls: Check that newly onboarded devices are authorized and receive approved configurations.
• Incident response: Verify that teams know how to investigate suspicious activity, contain incidents, and restore approved configurations.
• Resilience and recovery: Review configuration backups, recovery procedures, and the availability of alternate connectivity paths where required.

How Often Should SD-WAN Security Be Reviewed?

Review frequency should reflect the organization’s risk profile, regulatory obligations, network changes, and vendor recommendations. Perform additional reviews after major configuration changes, new branch deployments, significant security advisories, or suspected security incidents.

Document each review, assign responsibility for identified gaps, and track remediation through completion. Where possible, validate corrective actions rather than relying solely on policy documentation.

A structured audit process helps organizations maintain visibility into their SD-WAN security posture and identify configuration weaknesses before they become larger operational risks.

Having a hands-off attitude when it comes to managing SD-WANs will bring problems. Companies will need to deploy extra security technologies and protocols to ensure that sensitive data is protected until it arrives at its destination.