Making the case for CTEM

Testing your cyber-security once a year is like getting an annual medical checkup and assuming you’re healthy for the next twelve months, no matter what changes in between. Yet this remains how many organisations approach security assessment, despite operating in an environment where threats evolve, attack surfaces expand, and business technology changes so rapidly that a point-in-time assessment can become outdated within weeks, or even days. An annual penetration test is conducted, findings are presented to the board, remediation plans are agreed and then inevitably, attention shifts elsewhere.

 

Cyber-risk does not stand still. Between assessments, attack surfaces expand, business technologies evolve, and threat actors continuously adapt their methods. New vulnerabilities can emerge and be weaponised within days, largely thanks to AI, while existing weaknesses often remain unresolved for months. Periodic security validation offers only a snapshot of risk, not the continuous visibility organisations need to make informed security decisions. 

 

Ad-hoc approaches leave gaps in security coverage

Today, organisations operate across cloud platforms, SaaS applications, APIs, remote work environments and complex third-party ecosystems. Every new integration, application deployment or configuration change has the potential to alter the exposure of an organisation, often growing faster than governance processes can assess it.

 

The challenge is that traditional testing only provides a snapshot in time. It tells organisations what their exposure looked like on a particular day, but offers little visibility into what happens next. This can create a false sense of assurance, particularly at board level, where successful audits are sometimes mistaken for sustained resilience.

 

Moreover, remediation efforts frequently stall between testing cycles. Security teams identify vulnerabilities, develop action plans and assign ownership. Yet validating whether fixes have actually worked often requires additional testing and new resources, creating further delays. It still takes an average of 43 days to patch vulnerabilities. These pockets of inaction or delay create dangerous windows of opportunity for attackers.

 

The result is a visibility problem. Security leaders increasingly struggle to answer fundamental questions like: Which exposures matter most? How has risk changed since the last assessment? Are newly introduced technologies creating pathways that did not previously exist?

 

Regulation and expectations are changing

The shift toward continuous threat exposure management (CTEM) is not just about security operations, however. Regulators, customers, insurers, and boards are also raising expectations. Frameworks such as NIS2 and DORA place greater emphasis on operational resilience, continuous monitoring, and ongoing validation of security controls. Organisations are expected to demonstrate that cyber-security is being actively managed rather than periodically assessed.

 

Board expectations are evolving as well. Cyber-security discussions are moving beyond compliance exercises toward evidence-based conversations about resilience and risk reduction. Stakeholders want assurance that exposure is being minimised and monitored continuously, not simply reviewed once a year.

 

Customers and business partners are beginning to ask similar questions as attention turns to supply chains and the realisation that an organisation is only as secure as its weakest link. Demonstrating resilience increasingly requires proof of ongoing security validation rather than reliance on historical audit results. Organisations that embrace continuous approaches now will be better positioned to meet these expectations as they mature.

 

Why organisations need a continuous approach

This changing environment has led many security leaders to adopt Continuous Threat Exposure Management (CTEM), a framework focused on reducing cyber risks continuously by closing the loop between threat exposure assessment and validation to improve security posture. It’s a shift from ad hoc, static security testing to adopting a proactive security approach. It runs in a closed loop of five cycles.

 

The first step is scoping. Organisations must determine which assets, systems and business processes matter most. Not every exposure carries the same level of risk. Security efforts should focus on the areas that have the greatest operational, financial or reputational impact.

 

The second stage is discovery, which involves identifying vulnerabilities, misconfigurations, blind spots and newly exposed assets. Importantly, this extends beyond traditional vulnerability scanning. Exposure can emerge from technological changes, risky behaviours or gaps in visibility that would not appear in a standard assessment.

 

Next comes prioritisation. Security teams often face thousands of findings, but only a small percentage present meaningful business risk. Prioritisation requires organisations to evaluate exposure in context, considering factors such as critical business functions, sensitive data and likely operational consequences.

 

The fourth stage is validation. This is where organisations move beyond theoretical risk and assess whether identified exposures are genuinely exploitable. Through realistic attack simulations and adversary-based testing, security teams can determine whether existing controls would actually detect, prevent or contain an attack.

 

Finally, mobilisation focuses on taking action. Findings must translate into measurable improvements, with remediation efforts prioritised according to business impact and implemented quickly enough to reduce risk before adversaries can exploit it.

 

From snapshots to continuous visibility

The value of CTEM lies in its ability to replace assumptions with evidence. Rather than relying on annual assessments, organisations gain ongoing visibility into how their exposure changes over time, reflecting a broader evolution in cyber-security. Traditional approaches often focused on identifying vulnerabilities and measuring progress through the number of findings discovered or remediated. Modern security programmes recognise that understanding exploitability, business impact and control effectiveness is far more important than these volume-based metrics. 

 

Continuous exposure management helps organisations answer questions that periodic testing cannot: Which vulnerabilities are actually relevant to our environment? Which attack paths could realistically lead to business disruption? Are our controls capable of stopping the threats that matter most?

 

Answers to these questions are constantly changing. Without continuous visibility and validation, organisations risk making security decisions based on an outdated view of their exposure. 

 

Security must become continuous

Annual penetration tests will continue to play an important role, but they should no longer represent the entirety of an organisation’s exposure management strategy. Security leaders need continuous visibility into risk, ongoing validation of controls and a clear understanding of how that exposure evolves over time.

 

CTEM provides a framework for achieving that goal. More importantly, it represents a necessary evolution from periodic security assessments to continuous exposure management. The future of cyber-security assurance is not about proving you were secure six months ago. It is about understanding and proving whether you are secure today.

 

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Neena Sharma is a cyber-security specialist at Filigran

 

Main image courtesy of iStockPhoto.com and da-kuk