What Is Red Teaming as a Service (RTaaS)? A Guide to Continuous Adversarial Testing
Red Teaming has traditionally been delivered as a defined security exercise: agree the scope, simulate an attack, assess how the organization responds and report the results.
But attack surfaces no longer stand still between assessments.
Cloud environments evolve. Identities and permissions change. New applications are deployed. Vulnerabilities emerge. Threat actors adapt their techniques.
This is helping drive interest in Red Teaming as a Service (RTaaS): a more flexible approach to adversarial testing that enables organizations to validate their resilience against realistic threats on an ongoing or on-demand basis.
Gartner® identifies Red Teaming as a Service as an emerging technology in the Hype Cycle™ for XaaS, 2026, where Rootshell Security is listed as a Sample Vendor. Gartner rates the technology’s benefit as High, with market penetration currently between 5% and 20% of its target audience.
So, what exactly is RTaaS, how is it different from traditional Red Teaming and penetration testing, and where does it fit into a modern Continuous Testing and Continuous Threat Exposure Management (CTEM) strategy?
What is Red Teaming as a Service (RTaaS)?
Red Teaming as a Service is a subscription-based approach to threat-led adversarial testing that combines human expertise and automation to repeatedly evaluate an organization’s ability to withstand realistic cyberattacks.
Rather than treating Red Teaming solely as an isolated exercise, RTaaS makes adversarial testing available more continuously or on demand.
Gartner defines RTaaS as delivering:
“continuous, on-demand threat-led adversarial testing through a subscription model that combines humans and automation.”
The objective is broader than simply discovering vulnerabilities. RTaaS can evaluate the resilience of people, processes and technology and determine whether an organization can detect and respond to realistic attacker behaviour across the attack chain.
That distinction is important.
Finding a vulnerability answers one security question.
Understanding whether an attacker could combine weaknesses, evade controls, move through an environment and achieve a meaningful objective answers another.
Why is interest in Red Teaming as a Service growing?
The fundamental problem is speed.
According to Gartner:
“Defenders are falling behind as cloud, AI, and identity sprawl create attack surfaces that change daily, faster than annual assessments or static controls can track.”
The Gartner research highlights the challenge facing security teams: an assessment can provide extremely valuable evidence about security at the point it is conducted, but the environment continues changing after that assessment finishes.
New assets appear.
Configurations change.
Employees join or leave.
Applications are updated.
New vulnerabilities are disclosed.
Attackers develop new techniques.
Security validation therefore increasingly needs to account for what happens between traditional testing cycles.
RTaaS provides one way to introduce more frequent threat-led validation without requiring every organization to build and maintain a large internal Red Team.
RTaaS vs traditional Red Teaming: what’s the difference?
The biggest difference between traditional Red Teaming and Red Teaming as a Service isn’t necessarily the testing technique.
It’s the delivery model and cadence.
Traditional Red Team exercises are typically:
- Delivered as defined engagements
- Conducted within an agreed timeframe
- Built around specific objectives or scenarios
- Predominantly human-led
- Concluded with findings and recommendations
- Repeated periodically according to security requirements
RTaaS can instead provide:
- A subscription or service-based delivery model
- Repeated or on-demand adversarial testing
- Scenarios that evolve alongside threats and business priorities
- A combination of human expertise and automation
- Findings that feed into an ongoing improvement cycle
- More frequent resilience validation
This does not mean an organization needs a Red Team attacking its environment 24/7.
Continuous security testing is about applying the appropriate validation technique at the appropriate time based on risk, threat intelligence, environmental change and business priorities.
Is Red Teaming the same as penetration testing?
No. Although the disciplines overlap, they are designed to answer different security questions.
Penetration testing typically focuses on identifying and validating exploitable security weaknesses within an agreed scope.
Rootshell’s continuous penetration testing approach extends this by helping organizations validate risk more regularly as their environments evolve.
Red Teaming, meanwhile, takes a more adversarial, objective-led approach.
Testers emulate realistic attacker behaviours and may combine multiple techniques to determine whether they can reach a target or achieve an agreed objective.
This can also test whether security teams detect and respond to the attack.
The two approaches are therefore complementary rather than interchangeable.
For organizations adopting a Continuous Testing model, penetration testing can provide more frequent technical validation while Red Teaming can test broader resilience against realistic adversary behaviour.
The question isn’t necessarily whether an organization needs penetration testing or Red Teaming.
It’s about understanding which testing technique answers the security question you’re trying to solve.
What are the benefits of Red Teaming as a Service?
Gartner identifies several drivers behind RTaaS adoption, including the shortage of specialist offensive security skills, the need for continuous improvement, changing adversary behaviour, increasing cyberattack costs and growing regulatory expectations.
For security teams, this can translate into several practical benefits.
More realistic security validation
Vulnerability data can tell you where a theoretical weakness exists.
Adversarial testing can help determine whether weaknesses can actually be combined and exploited to achieve a meaningful outcome.
This provides security teams with additional context when deciding which exposures represent the greatest real-world risk.
Testing detection as well as prevention
Preventative controls will never eliminate every possible route into an organization.
Red Teaming can therefore test what happens when an attacker gets through those preventative layers.
Are they detected?
How quickly can defenders respond?
Can the attack be contained?
Do security processes work as expected when faced with realistic adversarial behaviour?
This moves the conversation beyond simply identifying vulnerabilities towards validating wider organizational resilience.
Validation against current threats
Threat intelligence can be converted into realistic testing scenarios based on attacker tactics, techniques and procedures.
This helps organizations ask a more valuable question than simply:
“Are we secure?”
Instead:
“How would our defences perform against the threats that matter to us?”
Continuous improvement
Repeated validation also allows security teams to test whether remediation and control improvements have actually changed the outcome.
Gartner describes RTaaS as enabling “continuous resilience gains” through repeated adversarial testing.
Instead of completing an assessment, implementing remediation and assuming the problem has been resolved, teams can validate whether their actions genuinely reduced exploitable risk.
Where do AI and automation fit into RTaaS?
Automation can dramatically increase the scale and speed of security testing.
It can support reconnaissance, data analysis, repeatable testing, attack surface monitoring and the processing of large volumes of security information.
AI can extend those capabilities further.
But neither removes the value of experienced security professionals.
Real adversaries are creative.
They combine weaknesses, change tactics, interpret context and make decisions based on what they discover.
Effective adversarial testing therefore requires judgement.
This is why Rootshell’s approach is Human-Led, AI-Augmented.
AI and automation can increase speed, scale and analytical capability. Human testers provide the creativity, contextual understanding, validation and decision-making needed to safely test real-world security resilience.
The objective isn’t to replace experienced security testers with AI.
It’s to use AI and automation to make experienced testers more effective.
How does RTaaS fit into Continuous Testing?
Red Teaming is powerful, but it doesn’t provide every form of security validation an organization needs.
A mature Continuous Testing program can combine complementary capabilities including:
- Continuous penetration testing
- Red Teaming and adversarial testing
- Attack surface management
- Vulnerability and exposure validation
- Threat-led testing
- Retesting and remediation validation
The aim isn’t to run every type of security test continuously.
Instead, it’s to move from a sequence of disconnected assessments towards an ongoing security validation program, where the right testing technique can be applied at the right time.
For example, continuous attack surface monitoring may identify a change in exposure.
A penetration tester can then determine whether that exposure is exploitable.
Threat intelligence may indicate that a particular attacker technique is increasingly relevant.
A Red Team exercise can then determine whether the organization’s controls can identify and respond to that behaviour.
Once remediation is implemented, testing can validate whether the attack path has actually been closed.
That makes Red Teaming one important component of a much wider Continuous Testing strategy.
How does Red Teaming as a Service support CTEM?
Continuous Threat Exposure Management (CTEM) is designed around continually understanding, prioritising and validating exposure rather than treating vulnerability management as a periodic activity.
Adversarial testing can contribute to the validation element of that process.
An organization may have thousands of vulnerabilities and potential exposures.
But not every vulnerability presents the same level of real-world risk.
The important questions include:
Can it actually be exploited?
Can it contribute to an attack path?
What could an attacker achieve?
Which business-critical assets could be affected?
Would existing controls detect or stop the attack?
Human-led security testing helps answer those questions.
Red Teaming can go further by examining how individual weaknesses could be combined within a realistic attack scenario and whether existing security controls can detect and contain that activity.
The Rootshell Platform helps bring exposure data, security testing and remediation activity together, supporting organizations as they operationalize CTEM.
Rather than treating security findings as isolated entries in separate reports and scanning tools, the goal is to build a clearer, ongoing view of exposure and remediation.
Is Red Teaming as a Service suitable for every organization?
Not necessarily.
The appropriate approach depends on an organization’s security maturity, risk profile, objectives and existing defensive capabilities.
Organizations need sufficient security maturity to turn findings into meaningful improvements.
Gartner highlights maturity dependency as one of the potential obstacles to RTaaS adoption, noting that organizations without established SOC capabilities, incident response processes or baseline detection capabilities may struggle to action findings effectively.
Adversarial testing on production systems also requires careful governance.
Testing needs clear rules of engagement, appropriate monitoring, agreed escalation processes, data-handling requirements and controls designed to minimise operational risk.
That means the right question isn’t simply:
“Should we continuously Red Team?”
It’s:
“What combination and cadence of security validation is appropriate for our risk, maturity and objectives?”
For some organizations, frequent penetration testing may be the priority.
For others, attack surface visibility may need to improve first.
More mature security teams may benefit from repeated threat-led adversarial exercises that test detection and response capabilities alongside technical controls.
Continuous Testing allows that program to evolve with the organization.
Rootshell Security named as a Sample Vendor for Red Teaming as a Service
Rootshell Security is listed as a Sample Vendor for Red Teaming as a Service in the Gartner® Hype Cycle™ for XaaS, 2026.
We believe the emergence of RTaaS reflects a wider change taking place across offensive security: organizations need ways to validate security more frequently as their environments and threats evolve.
For Rootshell, Red Teaming forms one part of our wider Human-Led Continuous Testing approach.
Continuous penetration testing, Red Teaming, attack surface management and exposure validation answer different security questions.
Bringing those capabilities together gives organizations a way to apply the right type of security validation at the right time.
Because security doesn’t change once a year.
Neither should testing.
Explore the Gartner® Hype Cycle™ for XaaS, 2026
Want to explore the technologies shaping the future of XaaS and learn more about Gartner’s analysis of Red Teaming as a Service?
Download the Gartner® Hype Cycle™ for XaaS, 2026 and explore the research.
FAQs
What does RTaaS stand for?
RTaaS stands for Red Teaming as a Service. It describes a service-based model for delivering continuous or on-demand adversarial security testing using a combination of human expertise and automation.
What is the difference between RTaaS and traditional Red Teaming?
Traditional Red Teaming is commonly delivered as a defined engagement at a particular point in time. RTaaS uses a subscription-based model that can support repeated or on-demand adversarial testing, allowing scenarios and testing activity to evolve alongside changes in threats and organisational priorities.
Is RTaaS the same as continuous penetration testing?
No. Continuous penetration testing primarily focuses on repeatedly identifying and validating technical vulnerabilities. RTaaS uses adversarial scenarios to test wider resilience across people, processes and technology. Both can form part of a broader Continuous Testing programme.
Does continuous Red Teaming mean testing 24/7?
Not necessarily. Continuous validation is about having the ability to apply testing at a cadence appropriate to an organization’s risks, threats, changes and objectives. It doesn’t mean every security testing technique must operate constantly.
Can AI replace human Red Teamers?
AI and automation can increase the speed and scale of some security testing activities, but human expertise remains important for creativity, judgement, contextual understanding and safely emulating realistic adversaries. Rootshell describes this model as Human-Led, AI-Augmented.
Does Red Teaming as a Service support CTEM?
RTaaS can support the validation element of a Continuous Threat Exposure Management program by helping determine whether identified exposures can contribute to realistic attack paths and whether existing controls can detect and respond to adversarial behaviour.
