Free Network Security Audit Checklists
Conduct a thorough, structured review of your organization's network infrastructure with this network audit checklist
Network Security Audit
This free network security audit checklist is built for IT managers and network security teams conducting a thorough review of an organization's network infrastructure and security posture. It covers the core domains of a network audit, like firewall configuration, computers and network devices, user accounts, malware protection, software inventory, and network security protocols.
Flag items requiring corrective action using Yes/No/N/A responses across all audit domains
Attach photos, screenshots, and network configuration files directly to checklist items as supporting evidence
Assign remediation actions to specific team members with notes on priority and follow-up steps
Summarize audit findings, add recommendations, and complete the report with a digital sign-off and timestamp
Export completed audits as PDF, Word, or Excel for sharing with leadership, compliance teams, or external auditors
What Is a Network Security Audit?
A network security audit is a systematic review of an organization's network infrastructure, security controls, access policies, and configurations against a defined standard or baseline. The goal is to uncover vulnerabilities, verify that defenses are operating as intended, and produce a risk-rated findings report that drives remediation.
A network security audit is typically performed at least annually, and additionally after major infrastructure changes such as cloud migrations, acquisitions, new office locations, or significant changes to remote access architecture.
What Does a Network Security Audit Cover?
A network security audit is narrower in scope than a full IT security audit — it focuses specifically on the network layer and the controls that protect it. The key domains it covers include:
Domain | What Is Reviewed |
Firewall and perimeter controls | Ruleset review, inbound/outbound policy, DMZ configuration, change records |
Network segmentation | VLAN configuration, internal firewall rules, separation between production/corporate/guest zones |
Access controls and authentication | VPN policies, remote access MFA enforcement, admin account management |
Network device security | Router and switch hardening, firmware version review, and default credential removal |
Wireless network security | Encryption standard (WPA2/WPA3), rogue access point detection, and guest network isolation |
Vulnerability and patch management | Scan coverage, CVE remediation timelines, EOL device inventory |
Traffic monitoring and logging | IDS/IPS coverage, NetFlow or SIEM ingestion, log retention |
Incident response readiness | IR plan currency, contact lists, and tabletop exercise records |
Cloud and remote network controls | VPN or Zero Trust configuration, cloud network security groups, SaaS access policies |
Types of Network Security Audits
Below is an overview of the most common types of network security audits:
Internal Network Audit
Conducted by the organization's own IT or security team, and typically used for routine compliance checks, pre-assessment readiness reviews, or quarterly vulnerability validation. Less resource-intensive but subject to independence limitations — the person testing a control should not be the one who designed or operates it.
External Network Audit
Performed by a third-party security firm. Required for standards that mandate independent attestation (PCI DSS, SOC 2 Type II). Provides an outside-in view of the network's attack surface, including what is visible from the internet.
Vulnerability Assessment
A targeted scan of network devices, systems, and applications to identify known weaknesses and unpatched CVEs. Typically automated using tools such as Tenable Nessus, Qualys, or Rapid7. A vulnerability assessment is one component of a broader network audit — not a full replacement for it.
Penetration Test (Network-focused)
Ethical hackers actively attempt to exploit network vulnerabilities to demonstrate real-world impact. Results from a network pen test are valuable audit evidence, particularly for perimeter and segmentation controls.
Compliance-Driven Network Audit
Scoped specifically to meet the network control requirements of a regulatory framework — PCI DSS network segmentation requirements, HIPAA technical safeguards, or NIST CSF Protect/Detect functions. The standard largely dictates the checklist.
Wireless Security Audit
Dedicated review of the wireless network environment, including access point configurations, encryption protocols, SSID management, rogue device detection, and guest network isolation.
For a broader organizational review, check security audit checklist, which covers access controls, data protection, and physical safeguards.
How to Conduct a Network Security Audit
Before testing begins, complete an IT risk assessment to define your threat landscape and prioritize in-scope assets.
Phase 1: Scoping and Planning
Define the boundaries of the audit in writing:
Define the network scope — which subnets, segments, remote sites, cloud virtual networks, and SaaS connections are in scope.
Identify applicable frameworks — NIST CSF, CIS Controls v8, PCI DSS, HIPAA, ISO 27001, or SOX. Define which control families map to the network layer.
Assign roles and ownership — name the audit lead, network team evidence owner, and any third-party testers. Clarify independence requirements.
Gather baseline documentation — collect existing network diagrams, firewall ruleset exports, IPAM records, asset inventories, and previous audit reports before testing starts.
Schedule and communicate — brief all stakeholders, confirm testing windows, and flag any systems that require pre-notification (intrusion prevention systems that may block scan traffic, for example).
Phase 2: Discovery and Asset Inventory
A reliable audit starts with an accurate picture of the network:
Network scanning — run discovery scans (Nmap, Nessus, or equivalent) to enumerate live hosts, open ports, operating system fingerprints, and running services. Compare results against the CMDB or asset register.
Network diagram validation — verify that current network diagrams accurately reflect topology, including cloud environments, branch offices, and remote access gateways. Outdated diagrams are one of the most common sources of missed scope.
Unauthorized device detection — identify devices present on the network that do not appear in the authorized asset inventory.
Cloud network asset enumeration — pull security group configurations, routing tables, and peering configurations from AWS, Azure, or GCP consoles.
Phase 3: Control Testing and Evidence Collection
Test each control against a defined pass/fail criterion and collect acceptable evidence:
Firewall and Perimeter
Pull current firewall ruleset exports and review for overly permissive rules, any-any rules, or rules with no documented business justification.
Verify that the firewall change management process is followed: every active rule should have a corresponding change ticket.
Confirm that firewall firmware is current and not end-of-life.
Network Segmentation
Review VLAN assignments and inter-VLAN routing rules.
Verify that production systems are isolated from development, guest, and corporate zones.
For PCI DSS environments, confirm that the cardholder data environment (CDE) is segmented and confirm segmentation controls with testing (this is a mandatory PCI DSS requirement).
Access Controls and VPN
Confirm MFA is enforced for all VPN and remote access connections.
Review admin account roster for network devices: remove or disable any accounts for former employees or vendors.
Check that default credentials have been changed on all network devices — routers, switches, wireless access points, and network management consoles.
Wireless Security
Confirm WPA2 or WPA3 encryption is in use on all access points. Flag any access points still running WEP or TKIP.
Verify that guest Wi-Fi is isolated from the corporate network.
Run a rogue access point scan to detect unauthorized wireless devices.
Vulnerability Management
Review the most recent authenticated vulnerability scan report (target: completed within the past 90 days).
Confirm critical CVEs (CVSS ≥ 9.0) have been remediated within the defined SLA (typically 14–30 days).
Check for end-of-life devices and operating systems — these represent permanent unpatched vulnerability exposure.
Logging and Monitoring
Confirm IDS/IPS is deployed and actively alerting.
Verify that network device logs (firewall, router, switch) are ingested into the SIEM.
Review log retention configuration — confirm it meets your applicable framework minimum (12 months is typical; PCI DSS requires 12 months with 3 months immediately available).
Phase 4: Analysis and Reporting
Triage findings — for each gap, document: asset or control affected, finding description, risk rating (Critical/High/Medium/Low), evidence citation, business impact, and recommended remediation.
Validate with the network team — share draft findings for factual accuracy before finalizing.
Produce the audit report — include an executive summary, full findings table, evidence inventory, and framework mapping appendix.
Issue the remediation plan — assign an owner, target date, and retest date to every finding.
Retest — verify remediation for Critical and High findings within 30–60 days. Document retest results as a formal close-out record.
For guidance on risk rating and control evaluation methodology, learn about security risk assessment.
What to Include in a Network Security Audit Report
A complete network security audit report should contain:
Executive Summary — audit scope, testing dates, overall risk posture, count of Critical/High/Medium/Low findings, and top three strategic recommendations for leadership.
Scope Statement — documented boundaries including all subnets, cloud environments, remote sites, and third-party connections reviewed.
Methodology — tools used, testing approach, and any testing limitations or exclusions.
Findings Table — each finding documented with: control reference, asset affected, finding description, evidence, risk rating, business impact, and recommended remediation.
Evidence Inventory — index of all collected artifacts (scan reports, config exports, screenshots) with file names, collection date, and responsible owner.
Framework Mapping Appendix — checklist items cross-referenced to applicable compliance standards.
Remediation Plan — owner, target date, retest date, and current status for every finding.
FAQs About Network Security Audits
Related Network Security Audit Templates
IT Risk Assessment Template
This free IT risk assessment template is designed for IT professionals and security teams performing security risk and vulnerability assessments across an organization's internal IT infrastructure. It guides users through identifying threat sources, documenting existing controls, and evaluating overall risk ratings.
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