IT Security Audit for UK Businesses: Identify Vulnerabilities Before Attackers Do
AMVIA's IT security audit provides a structured, independent assessment of your cybersecurity posture — identifying vulnerabilities, configuration weaknesses, and compliance gaps before they can be exploited. You receive a prioritised report with practical remediation recommendations.
What is an IT Security Audit?
An IT security audit is a systematic assessment of your organisation's security controls, configurations, and practices against a defined framework — typically Cyber Essentials, ISO 27001, or NCSC guidance. AMVIA's audit covers your network infrastructure, endpoint security, identity and access management, email security, cloud configuration, and security governance practices. The output is a risk-rated report with prioritised recommendations. 43% of UK businesses experienced a cybersecurity breach or attack in the past 12 months, equating to approximately 612,000 businesses (DSIT Cyber Security Breaches Survey 2025). 67% of medium businesses and 74% of large businesses reported breaches in 2025.
Learn about managed cybersecurityWhy Security Audits Matter for SMEs
Many security incidents affecting UK SMEs involve vulnerabilities or misconfigurations that have existed for months or years — outdated software, weak account controls, open firewall rules, default credentials on network devices. Without a formal audit process, these issues often go undetected until they are exploited.
Legacy authentication left enabled "just for that one app" — despite being the vector for 99%+ of password spray attacks (Thehackernews)
More than 99% of password spray attacks use legacy authentication (Microsoft)
Stolen or compromised credentials were the initial attack vector in 22% of data breaches in 2024 — the single largest cause of breaches, surpassing phishing (16%) and software vulnerabilities (Verizon DBIR 2025). (ITPro)
A security audit provides an external perspective on your posture — identifying risks that are invisible from the inside because they have become normalised over time. For businesses that have grown organically, merged with others, or changed IT providers, an audit often reveals configuration debt that has accumulated across multiple changes.
What AMVIA's Security Audit Covers
AMVIA structures security audits around the NCSC's Cyber Essentials framework, which covers the controls that address the majority of common attacks. The audit covers: boundary firewall and router configuration; secure device and software configuration; access control and account management; malware protection and endpoint security; and patch management across all in-scope devices.
Beyond the CE framework, AMVIA's audit also reviews Microsoft 365 configuration — Conditional Access policies, MFA enforcement, email authentication settings, and admin account security. Cloud misconfigurations are a common source of risk in organisations that have adopted M365 without specialist configuration support.
Technical Assessment Methods
AMVIA uses a combination of configuration review, authenticated vulnerability scanning, and manual inspection. Authenticated scanning accesses devices with valid credentials to assess patch compliance, software inventory, and configuration settings from the inside — providing more accurate results than unauthenticated external scans, which can only see what is visible from the network boundary.
Network traffic analysis identifies unexpected communication patterns — devices connecting to unusual external destinations, internal lateral movement, or protocols being used on non-standard ports. Combined with firewall rule review, this provides a comprehensive picture of your network boundary security.
The Audit Report
AMVIA delivers a written audit report covering all findings, rated by risk severity (critical, high, medium, low). Each finding includes: a description of the vulnerability or misconfiguration; the potential impact if exploited; a specific remediation recommendation; and an estimated remediation effort. Critical and high findings are discussed in a debrief call with your technical lead or IT decision-maker.
The report is designed to be actionable — not a theoretical list of every possible risk, but a practical prioritised guide to where your effort and investment should go. AMVIA can provide remediation support as a follow-on engagement or incorporate findings into an ongoing managed security programme.
Compliance Audits
For businesses targeting Cyber Essentials or Cyber Essentials Plus certification, AMVIA's audit includes a specific assessment against the CE technical requirements, identifying exactly which controls need to be in place before assessment. This gap analysis approach reduces the risk of failing the formal CE assessment and the additional cost that involves.
For businesses with ISO 27001 requirements or FCA operational resilience obligations, AMVIA's audit scope can be extended to cover the relevant framework requirements. AMVIA will scope the audit appropriately during the initial consultation.
Frequency and Ongoing Review
A security audit is a point-in-time assessment. AMVIA recommends conducting a formal audit at least annually, or following significant changes to the IT environment — a new office, a merger, a major technology migration, or a change of IT provider. Businesses on AMVIA's managed service receive quarterly security posture reviews as part of the standard service, providing ongoing visibility between formal audits.
AMVIA Security Audit: What's Covered
A structured assessment of every layer of your cybersecurity posture.
Network & Firewall Review
Firewall rules, boundary controls, and network segmentation assessed against best practice.
Endpoint Security Assessment
Patch compliance, endpoint protection configuration, and device baseline security checked on all in-scope devices.
Identity & Access Review
MFA enforcement, admin account hygiene, Conditional Access policies, and guest account management assessed.
Microsoft 365 Configuration
M365 security settings reviewed: Exchange Online, SharePoint, Teams, and Entra ID Conditional Access.
Email Security Assessment
DMARC, DKIM, SPF, and email filtering configuration checked against phishing and spoofing risk.
Risk-Rated Report
All findings prioritised by severity with specific remediation recommendations and estimated effort.
Security Audit Preparation Checklist
Information and access you will need to have ready for an effective security audit.
Current IT inventory available
List of all devices, servers, and cloud services in scope for the audit.
Network diagram or topology overview
Documentation of how your network is structured, including VLAN configuration and firewall rules.
M365 global admin access for assessor
Read-only admin access to Microsoft 365 and Entra ID for configuration review.
Firewall management access available
Access to firewall configuration for rule review — read-only access is sufficient.
Previous audit report (if available)
Prior audit findings help assess remediation progress and identify recurring issues.
Key stakeholder available for debrief
IT lead or IT decision-maker available to receive and discuss findings after the audit.
IT Security Audit FAQs
The duration depends on the size and complexity of your environment. For a typical SME with 20 to 100 users and a standard Microsoft 365 environment, the technical assessment typically takes one to two days, with a further two to three days for analysis and report preparation. The written report and debrief are usually delivered within five to seven working days of the assessment.
No. A security audit is independent of Cyber Essentials certification. Many businesses use an audit as the first step before pursuing CE certification — the audit identifies what needs to be in place, and AMVIA remediates the gaps before the formal assessment. Others use audits to maintain ongoing visibility of their security posture regardless of certification status.
Vulnerability scanning and configuration review are read-only activities that should not disrupt normal system operation. AMVIA discusses the assessment methodology with you before starting and schedules any activities that carry risk of impact (such as intensive scanning) during lower-traffic periods. Disruption to daily operations is rare and AMVIA will communicate any planned downtime in advance.
A security audit assesses your configuration, controls, and processes against a framework. A penetration test actively attempts to exploit vulnerabilities — testing whether attackers could compromise your systems if they tried. Both have value, but they serve different purposes. An audit is typically the right starting point for businesses without a formal security programme; penetration testing is more appropriate once baseline controls are in place.
Understand Your Security Posture
AMVIA's security audit gives you an honest, prioritised assessment of your cybersecurity risk. Book a consultation to discuss scope and timing.
Related Security Resources
Cyber Essentials Plus
How AMVIA prepares your environment for CE+ certification following an audit.
Managed Cybersecurity Services
Ongoing managed security that builds on audit findings with continuous protection.
Managed Vulnerability Management
Continuous vulnerability scanning and remediation beyond the point-in-time audit.