What is a vulnerability assessment?

A vulnerability assessment is an automated scan that detects and ranks known security weaknesses, such as misconfigurations, missing patches, or software flaws, without attempting to exploit them.

What is the difference between a penetration test and a vulnerability scan?

A vulnerability scan identifies and prioritizes potential risks, while a penetration test attempts to exploit those risks in real-world attack scenarios to validate exploitability and measure security readiness.

Do I need both a penetration test and a vulnerability scan?

Yes. A vulnerability assessment highlights potential weaknesses, and a penetration test validates how they can be exploited. Together, they provide a complete view of your security posture and help meet compliance requirements.

How often should penetration testing be performed?

Penetration testing should be performed at least annually or after major infrastructure changes. Many compliance frameworks, including PCI DSS and HIPAA, require regular pen testing.

What is the Difference Between a VA Scan and a Pen Test?

Q: What is penetration testing?

Penetration testing is an ethical hacking process where security experts simulate cyberattacks to identify and exploit vulnerabilities in systems before malicious actors do.

RSI Security

3 weeks ago

In cybersecurity, identifying vulnerabilities is only half the battle. To build a strong defense, organizations must regularly scan for weaknesses and test their systems through penetration testing. Penetration testing and vulnerability assessments are both essential, but they serve different purposes.

This guide explains how each works, when to use them, and how they can work together to protect sensitive data and critical systems.

What is Penetration Testing?

Penetration testing, also called pen testing, is a cybersecurity practice where ethical hackers simulate real-world attacks to uncover and exploit security gaps before malicious actors can. Security professionals use the same tools, tactics, and procedures as cybercriminals to evaluate how well defenses perform under realistic conditions.

A penetration test helps organizations:

Identify and validate exploitable vulnerabilities
Assess detection and incident response readiness
Meet compliance requirements (PCI DSS, HIPAA, NIST, and others)
Demonstrate strong security practices to clients and stakeholders

Types of Penetration Testing

Penetration tests vary depending on the target environment. Common types include:

External Testing: Simulates attacks from outside the network (e.g., internet-based threats)
Internal Testing: Models insider threats, such as malicious or compromised employees
Web Application Testing: Focuses on vulnerabilities in websites and applications
Wireless Testing: Evaluates the security of Wi-Fi and other wireless networks
Social Engineering: Tests employee response to phishing, baiting, or pretexting attempts

Penetration Testing Methodologies

Different penetration testing methodologies depend on how much information the tester has before the engagement:

Black Box: No prior knowledge of the system, realistic but time-consuming
White Box: Full system knowledge, efficient but less realistic
Gray Box: Partial knowledge, balances realism with efficiency

Organizations should conduct penetration testing at least annually or after significant infrastructure changes. Many compliance frameworks including PCI DSS, HIPAA, and NIST, require regular penetration testing as part of a comprehensive security strategy.

Need a Penetration Test? Learn more.

Key Differences Between Pen Tests and Vulnerability Scans

Category	Vulnerability Assessment	Penetration Test
Purpose	Identify and rank known weaknesses	Simulate real-world attacks to exploit vulnerabilities
Approach	Automated scanning	Manual + automated, attacker mindset
Output	Risk report with severity scores	Proof-of-concept attacks, security improvement guidance
Frequency	Quarterly or more often	At least annually, or after major changes
Compliance Fit	Useful for ongoing monitoring	Required for PCI DSS, HIPAA, and others
Cost & Complexity	Lower cost, less intrusive	Higher cost, deeper insights

Why You Need Both Vulnerability Assessments and Penetration Testing

A vulnerability assessment shows what could be exploited, while penetration testing demonstrates how an attacker would exploit it. Used together, they provide a holistic view of your security posture, identifying risks and validating which ones are truly exploitable.

This combined approach enables security teams to:

Prioritize fixes based on real-world impact, not just theoretical flaws
Maintain continuous security improvement through remediation and retesting
Meet regulatory expectations from PCI DSS, HIPAA, NIST, and other frameworks.

Example workflow:

Start with a vulnerability assessment to uncover broad weaknesses
Follow up with penetration testing to validate and measure exploitability
Remediate identified issues and retest to confirm gaps are closed

Many compliance standards recommend or require both methods to demonstrate due diligence and ensure organizations stay ahead of evolving threats.

Get a Free Vulnerability Assessment

How RSI Security Can Help With Penetration Testing and Vulnerability Assessments

At RSI Security, we provide both penetration testing and vulnerability assessment services to help organizations strengthen their defenses and meet compliance requirements. Our cybersecurity specialists deliver tailored testing programs based on your industry, infrastructure, and regulatory needs.

With RSI Security, you can:

Schedule one-time or recurring penetration testing engagements
Implement ongoing vulnerability management for continuous protection
Ensure compliance with frameworks like PCI DSS, HIPAA, and NIST
Gain actionable insights to remediate risks before attackers exploit them

Get started today by purchasing a penetration test or vulnerability scan directly from our online store, or request a complimentary consultation with our experts.