Cyberattacks are no longer a problem reserved for large corporations. Small businesses, online stores, schools, professional firms and individuals can all become targets of cybercriminals.

One of the best ways to improve cybersecurity is to understand what could go wrong before attackers discover it.

That’s where Threat and Vulnerability Assessments come in.

A threat and vulnerability assessment helps an organization identify potential threats, discover weaknesses in its systems and prioritize the security improvements that matter most.

For Nigerian businesses that depend on websites, cloud services, Microsoft 365, mobile devices, online banking and customer databases, understanding these basics can be an important first step toward stronger cybersecurity.

What Is a Threat Assessment?

A threat assessment focuses on identifying potential events, people or situations that could cause harm to an organization.

A threat could come from:

• Cybercriminals
• Malware
• Phishing campaigns
• Insider threats
• Stolen credentials
• Ransomware
• Social engineering
• Lost or stolen devices
• Supply-chain attacks
• Natural disasters
• Power or infrastructure failures

The key question is:

“What could potentially harm our systems, data or business operations?”

What Is a Vulnerability Assessment?

A vulnerability assessment focuses on finding weaknesses that attackers could potentially exploit.

A vulnerability might include:

• Outdated software
• Weak passwords
• Misconfigured servers
• Unpatched operating systems
• Excessive user permissions
• Exposed services
• Insecure websites
• Poor network configurations
• Missing security controls
• Unsupported software
• Inadequate backup systems

The key question is:

“What weaknesses could an attacker exploit?”

Threat vs. Vulnerability

These two concepts are closely related but aren’t the same.

Simple example

Imagine a business has an internet-facing server running outdated software.

Threat: An attacker looking for vulnerable servers.

Vulnerability: Outdated software containing a known security flaw.

Risk: The attacker exploits the vulnerability and gains unauthorized access.

What Is Risk?

Risk is generally about the combination of likelihood and impact.

A simple way to think about it is:

Risk = Likelihood × Impact

For example:

A company discovers that an employee’s account has a weak password.

If that account has access to sensitive customer information, the potential impact could be significant.

The organization should therefore prioritize fixing the weakness.

Why Threat & Vulnerability Assessments Matter

A business may have hundreds of potential security weaknesses.

You can’t necessarily fix everything at once.

An assessment helps organizations determine:

1. What assets they have
2. What threats they face
3. What vulnerabilities exist
4. Which vulnerabilities are most important
5. What security controls are missing
6. What should be fixed first

This makes cybersecurity more structured and risk-based.

Step 1: Identify Your Assets

Before looking for vulnerabilities, you need to understand what you’re protecting.

Typical assets include:

Hardware

• Computers
• Laptops
• Servers
• Routers
• Firewalls
• Smartphones
• Printers
• Network equipment

Software

• Operating systems
• Business applications
• Databases
• Web applications
• Antivirus software
• Microsoft 365
• Cloud platforms

Data

• Customer information
• Employee records
• Financial information
• Passwords
• Business documents
• Intellectual property
• Backups

Online assets

• Websites
• Domains
• Email accounts
• Cloud services
• Social media accounts
• APIs

Step 2: Identify Potential Threats

Next, determine what could potentially attack or disrupt these assets.

For example:

Website

Potential threats:

• Web attacks
• Credential theft
• DDoS attacks
• Malicious file uploads
• Data breaches

Employee laptop

Potential threats:

• Malware
• Phishing
• Theft
• Unauthorized access
• USB-based attacks

Cloud account

Potential threats:

• Stolen credentials
• Account takeover
• Misconfiguration
• Insider misuse

Step 3: Identify Vulnerabilities

Now look for weaknesses.

Common examples include:

Outdated software

An old operating system may contain known vulnerabilities.

Weak passwords

Simple or reused passwords can make account compromise easier.

Missing MFA

If an attacker steals a password, multi-factor authentication can provide another layer of protection.

Misconfigured firewall

A poorly configured firewall may expose services unnecessarily.

Excessive permissions

Users shouldn’t automatically have access to every system or file.

Unsecured websites

Websites may contain vulnerabilities involving authentication, access control, configuration or application logic.

Step 4: Perform Vulnerability Scanning

Organizations can use vulnerability scanners to identify potential weaknesses.

Depending on the environment, security teams may assess:

• Operating systems
• Network devices
• Servers
• Websites
• Cloud infrastructure
• Databases
• Applications

Common vulnerability-management platforms include:

• Nessus
• OpenVAS/Greenbone
• Qualys
• Rapid7
• Microsoft Defender Vulnerability Management

However, a scanner is not a replacement for human analysis.

Automated tools can produce false positives, miss business-logic vulnerabilities and fail to understand the organization’s specific risk.

Step 5: Validate the Findings

Not every scanner result represents a real security problem.

Security professionals should verify important findings.

For example, a scanner might report:

Critical vulnerability detected

Before immediately treating that finding as confirmed, the security team should determine:

• Is the affected software actually installed?
• Is the vulnerable version running?
• Is the system exposed?
• Is the vulnerability exploitable in this environment?
• Is there a compensating security control?
• Does the vulnerability affect sensitive data?

This process helps reduce false positives.

Vulnerability Severity

Vulnerabilities are often categorized according to their severity.

A common system is the Common Vulnerability Scoring System (CVSS).

CVSS provides a standardized method for communicating the severity of vulnerabilities. The current CVSS standard is maintained by the Forum of Incident Response and Security Teams (FIRST). (first.org)

Typical severity categories include:

Important

A CVSS score should not automatically determine your business priority.

A medium-severity vulnerability affecting your organization’s most sensitive database may deserve more attention than a high-severity issue affecting an isolated test system.

Threat Modeling

Another useful technique is threat modeling.

Threat modeling asks:

“How could an attacker potentially abuse this system?”

Security teams can examine:

• Assets
• Entry points
• Trust boundaries
• Data flows
• Authentication
• Authorization
• Potential attack paths

One popular framework is STRIDE, which considers categories such as:

• Spoofing
• Tampering
• Repudiation
• Information Disclosure
• Denial of Service
• Elevation of Privilege

Threat modeling is particularly useful when designing new applications or systems because security weaknesses can potentially be addressed before deployment.

Vulnerability Assessment vs. Penetration Testing

These terms are sometimes used interchangeably, but they’re not exactly the same.

Vulnerability Assessment

Generally focuses on:

Finding and identifying weaknesses.

Penetration Testing

Generally involves:

Authorized security testing designed to determine whether identified weaknesses can actually be exploited.

A vulnerability scanner might identify a potentially vulnerable service.

A penetration test can involve controlled validation of whether that weakness can actually be exploited.

Important

Penetration testing should only be conducted with explicit authorization from the system owner.

Risk Prioritization

Finding vulnerabilities is only half the job.

You need to decide which ones should be fixed first.

Consider:

1. Severity

How serious is the vulnerability?

2. Exploitability

How easy is it to exploit?

3. Exposure

Is the system accessible from the internet?

4. Asset importance

Does the system contain sensitive or critical information?

5. Existing controls

Are firewalls, MFA, endpoint protection or other controls reducing the risk?

6. Business impact

What happens if the system is compromised?

Example Risk Assessment

Imagine a Nigerian e-commerce company discovers these three issues:

The security team shouldn’t simply fix issues based on their numerical severity.

They should consider the actual business risk.

Common Threats Nigerian Businesses Should Consider

Businesses in Nigeria face many of the same cyber threats seen globally.

Some particularly important areas include:

Phishing

Attackers send fraudulent emails or messages designed to steal credentials or financial information.

Business Email Compromise

Criminals may compromise or impersonate business email accounts to manipulate employees into transferring money or sensitive information.

Ransomware

Attackers encrypt files or systems and demand payment.

Credential Theft

Stolen passwords can provide access to email, cloud services and business systems.

Mobile Banking Scams

Users may be targeted through fake apps, phishing links and social engineering.

Website Attacks

Poorly secured websites can expose customer information or be used to distribute malicious content.

Insider Threats

Employees or contractors may intentionally or accidentally expose sensitive information.

Basic Vulnerability Assessment Checklist

A small business can start with this checklist:

🔐 Authentication

• Strong passwords enforced
• MFA enabled
• Default passwords changed
• Dormant accounts disabled
• Privileged accounts reviewed

💻 Devices

• Operating systems updated
• Applications patched
• Endpoint security enabled
• Device encryption enabled where appropriate
• Lost-device controls enabled

🌐 Network

• Firewall configured
• Unnecessary services disabled
• Wi-Fi secured
• Network devices updated
• Guest networks separated where appropriate

🌍 Website

• HTTPS enabled
• CMS updated
• Plugins updated
• Admin accounts protected with MFA
• Backups available
• Security headers reviewed

☁️ Cloud

• MFA enabled
• User permissions reviewed
• Public storage checked
• Logging enabled
• Unused accounts removed

💾 Backup

• Critical data backed up
• Backups tested
• Offline/isolated backup considered
• Recovery process documented

Common Mistakes to Avoid

❌ Only scanning once

Cybersecurity is not a one-time project.

New vulnerabilities are discovered constantly.

❌ Fixing only “critical” vulnerabilities

A lower-severity issue can become important depending on how it connects to other weaknesses.

❌ Ignoring configuration

Security problems aren’t always caused by vulnerable software.

Misconfiguration can be equally dangerous.

❌ Forgetting human risk

Employees are part of the organization’s security environment.

Security awareness training should be part of the overall program.

❌ Not testing backups

A backup that has never been tested may not work when you need it.

❌ Assuming antivirus is enough

Endpoint protection is useful, but cybersecurity requires multiple layers of defense.

How Often Should You Perform an Assessment?

There’s no universal schedule that fits every organization.

However, businesses should consider assessments:

• Regularly
• After major infrastructure changes
• After deploying important applications
• After significant security incidents
• When new critical vulnerabilities emerge
• Before launching major systems
• When compliance requirements demand them

The larger and more complex the organization, the more structured its vulnerability-management program should become.

Useful Cybersecurity Frameworks

Organizations looking to build a more mature security program can use established frameworks.

NIST Cybersecurity Framework

The NIST Cybersecurity Framework (CSF) 2.0 provides guidance for managing cybersecurity risk and is designed for organizations of different sizes and sectors. (nist.gov)

Its core functions are:

Govern → Identify → Protect → Detect → Respond → Recover

CIS Controls

The CIS Critical Security Controls provide prioritized security practices organizations can use to strengthen their defenses. (cisecurity.org)

They are particularly useful for organizations that want practical, prioritized security measures.

A Simple Threat & Vulnerability Assessment Process

You can remember the process as:

1. Identify

What assets do we have?

⬇️

2. Discover

What threats and vulnerabilities exist?

⬇️

3. Analyze

How serious are they?

⬇️

4. Prioritize

Which problems should we fix first?

⬇️

5. Remediate

Patch, configure, replace or otherwise address the issue.

⬇️

6. Verify

Confirm that the problem has actually been resolved.

⬇️

7. Monitor

Continue looking for new threats and vulnerabilities.

Final Thoughts

A Threat and Vulnerability Assessment isn’t about trying to make a business 100% hacker-proof—that isn’t realistic.

Instead, it is about understanding your attack surface, identifying weaknesses and reducing the risks that matter most.

For a Nigerian business, even basic measures can make a significant difference:

Keep systems patched.

Enable MFA.

Use strong passwords.

Protect endpoints.

Secure websites.

Review user permissions.

Back up important information.

Train employees to recognize phishing and scams.

Most importantly, don’t wait until after a cyberattack to discover your weaknesses.

The best time to find a vulnerability is before an attacker does.