Red teaming is a controlled cybersecurity exercise that simulates how a real attacker could target an organisation. Instead of simply looking for vulnerabilities, a red team tries to achieve a defined objective while testing whether the organisation can detect and respond to the attack.

In simple terms, a vulnerability assessment asks what is vulnerable, while a penetration test checks whether specific weaknesses can be exploited. Red teaming goes further by combining technical, human, and physical attack methods to test how well the organisation can defend against a realistic attack.

CERT-In’s 2026 guidance specifically recommends red teaming, adversarial simulations, security assessments, and resilience validation exercises to test the effectiveness of cybersecurity controls and operational readiness.

What Is Red Teaming?

Red teaming is an authorised security exercise in which trained security professionals simulate a real attacker’s tactics and techniques. The objective, scope, rules of engagement, and safety controls are agreed in advance.

The goal is not to find the most vulnerabilities. It is to determine whether an attacker could reach a specific target and whether your security team would detect and respond to the activity.

For example, the objective could be to:

• Gain access to a critical application.
• Reach a sensitive database.
• Obtain privileged access.
• Demonstrate that sensitive information could be accessed.
• Test whether the security operations team detects the attack.

The organisation’s defensive team, often called the Blue Team, is also an important part of the exercise. The red team tests the attack path, while the Blue Team tests its ability to detect and respond. NIST(National Institute of Standards and Technology) describes red teaming as an authorised activity designed to emulate an adversary and improve both the organisation’s security and defensive capabilities.

Red Teaming vs Vulnerability Assessment vs Penetration Testing

These security assessments answer different questions. Understanding the difference helps organisations choose the right approach.

Security Exercise	Main Question	Typical Scope
Vulnerability Assessment	What known security weaknesses exist?	Broad and automated
Penetration Testing	Can specific vulnerabilities be exploited?	Defined system, application, or network
Red Teaming	Can a realistic attacker achieve a specific objective, and will we detect them?	Goal-based and may cover technical, physical, and human attack paths
Purple Teaming	How can attackers and defenders improve detection and response together?	Collaborative and focused on improving controls

A web application penetration test, for example, may identify weaknesses in the application but may not test physical access, employee behaviour, or lateral movement. Red teaming combines these attack paths when they are relevant to the defined objective.

If you are deciding whether your organisation needs penetration testing or a broader security assessment, our guide on VAPT audits can help you understand where each approach fits.

What Does Red Teaming Involve?

A red team can combine several areas of security testing depending on the agreed scope.

These may include:

• Technical testing: Identifying and exploiting weaknesses in networks, applications, endpoints, cloud environments, or identity systems.
• Social engineering: Testing whether employees can identify and resist realistic phishing or social engineering attempts.
• Physical security testing: Assessing whether physical controls can prevent unauthorised access where this is included in scope.
• Open source intelligence: Using publicly available information to understand the organisation’s people, technology, infrastructure, and potential entry points.
• Detection testing: Checking whether the SOC, SIEM, EDR, and other security controls detect suspicious activity.
• Response testing: Assessing how quickly and effectively the organisation responds when it detects an attack.

The exact combination depends on the objective and rules of engagement. Not every red team exercise needs to include every attack method.

The Red Teaming Process

A successful red team exercise needs clear planning before any testing begins. The process usually follows these stages:

1. Define the Objective and Scope

The organisation and red team agree on what the exercise should achieve.

This includes:

• The main objective.
• Systems and locations that are in scope.
• Systems that must not be tested.
• Testing methods that are allowed.
• Emergency contacts and stop procedures.
• Success criteria.

Clear rules help the team test realistically without creating unnecessary operational risk.

2. Conduct Reconnaissance

The team collects information about the organisation using methods that a real attacker could use.

This may include publicly available information about:

• Employees and organisational roles.
• Technology and infrastructure.
• Internet-facing systems.
• Publicly exposed information.
• Previous data exposure.
• Potential physical entry points.

This phase helps the team identify the most realistic attack paths.

3. Attempt Initial Access

The team then attempts to gain an initial foothold using methods allowed by the engagement.

Depending on the scope, this could involve:

• Phishing or social engineering.
• Exploiting an external vulnerability.
• Testing exposed services.
• Exploiting a cloud misconfiguration.
• Testing physical security controls.

The focus is on realistic attack paths rather than using the most complex technique available.

4. Establish Access and Escalate Privileges

After gaining initial access, the team attempts to increase its access level and move closer to the agreed objective.

This may involve testing:

• Weak credentials.
• Excessive permissions.
• Misconfigured systems.
• Identity and access controls.
• Internal network segmentation.
• Security monitoring.

The team should remain within the agreed rules throughout this stage.

5. Move Towards the Objective

The red team attempts to move through the environment and reach the defined target.

The objective might be access to a critical application, privileged account, sensitive database, or specific type of information.

The team does not need to compromise every system it can reach. The focus remains on demonstrating whether the defined business objective could be achieved.

6. Test Detection and Response

A key part of red teaming is understanding whether the organisation can detect and respond to the simulated attack.

The exercise can show:

• Which activities were detected.
• How quickly alerts were raised.
• Whether the SOC investigated them.
• How the incident response team reacted.
• Where detection or response gaps existed.

This is one of the main differences between red teaming and many traditional security tests.

7. Report Findings and Improve Controls

The final report should explain the attack path, what worked, what was detected, what was missed, and where the attack could have been stopped.

The exercise can then move into a Purple Team activity where the Red and Blue Teams work together to improve detection and response controls.

What Are the Benefits of Red Teaming?

Red teaming helps organisations understand how their security controls perform against a realistic attack, not just individual vulnerabilities.

Key benefits include:

• Identifying attack paths that traditional testing may not reveal.
• Testing people, processes, and technology together.
• Measuring the effectiveness of security monitoring.
• Testing incident detection and response capabilities.
• Identifying weaknesses in identity and access controls.
• Understanding the potential impact of a successful attack.
• Providing evidence to prioritise security improvements.

The biggest value is often not the vulnerability itself but the complete attack path. A red team may show how several smaller weaknesses can be combined to reach a critical system.

CERT-In’s guidance also emphasises that security audits and assessments should focus on improving an organisation’s cyber infrastructure rather than being performed only for compliance.

A Simple Red Teaming Example

Consider a financial services organisation with a critical customer application.

The red team’s objective is to determine whether an attacker could reach the application backend.

The team may begin by gathering publicly available information about the organisation and its employees. It could then identify an exposed system or test an approved social engineering scenario to obtain initial access.

From there, the team may attempt to move through the internal environment, escalate privileges, and reach the target system.

The final result is not simply a list of vulnerabilities. It shows the complete attack path, how far the simulated attacker could go, which controls detected the activity, and where the organisation could have stopped the attack earlier.

When Should an Organisation Consider Red Teaming?

Red teaming is generally more useful once an organisation has established basic security controls and wants to test how well they work together.

It can be particularly useful when:

• The organisation operates critical systems or sensitive data.
• The business faces a high level of cyber threat.
• Security monitoring and SOC capabilities are already in place.
• The organisation has completed regular VAPT or penetration testing.
• Leadership wants to measure real attack resilience.
• The organisation needs to test incident detection and response.
• Major changes have been made to its infrastructure or security architecture.

Red teaming should not replace vulnerability assessments or penetration testing. These activities serve different purposes and can complement each other.

How We Approach Red Teaming

Our red team engagements are built around a defined objective, clear rules of engagement, and realistic attack scenarios.

Our technical services team can combine technical, social engineering, and other assessment capabilities based on your organisation’s risk profile and agreed scope.

We can help organisations:

• Define red team objectives and scope.
• Assess realistic attack paths.
• Test technical and human security controls.
• Evaluate detection and response capabilities.
• Identify gaps across people, processes, and technology.
• Provide detailed attack path and remediation reports.

For organisations that are still addressing basic technical vulnerabilities, we generally recommend establishing a strong VAPT programme before moving to a broader red team exercise. This builds a stronger foundation and lets the red team focus on how well the remaining controls work together.

Final Thoughts

Red teaming gives organisations a realistic view of how an attacker could move through their environment and whether their security teams would detect and stop the attack.

It should not replace vulnerability assessments or penetration testing. Instead, it complements them by testing the organisation as a whole across technology, people, processes, detection, and response.

For organisations looking to improve their cyber resilience, a well-scoped red team exercise can turn security assumptions into measurable evidence and help prioritise the controls that matter most.

FAQs

1. What is red teaming in cybersecurity?

Red teaming is an authorised security exercise that simulates a real-world attack to test whether an organisation can prevent, detect, and respond to it.

2. How is red teaming different from penetration testing?

Penetration testing focuses on exploiting vulnerabilities within a defined scope. Red teaming takes a broader approach and tests whether an attacker can achieve a specific objective using technical, human, or physical attack methods.

3. What does a red team test?

A red team can test technical security controls, employee awareness, physical security, access controls, detection capabilities, and incident response, depending on the agreed scope.

4. When should an organisation conduct a red team exercise?

It is most useful when an organisation already has basic security controls and wants to test its overall ability to detect and respond to realistic attacks.

5. Does red teaming replace VAPT or penetration testing?

No. Red teaming complements VAPT and penetration testing. VAPT helps identify and address known vulnerabilities, while red teaming tests how well the organisation can withstand a realistic attack.