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The Reality Behind Security Control Failures—And How to Prevent Them. There’s a clear gap between expectation and reality when it comes to security controls. Despite deploying best-in-class security tools and building capable teams, many organizations discover the truth only after a breach: their controls weren’t working as expected. Think of changing a lightbulb—you turn it on to check if it works. Security controls rarely get the same validation. Instead, success criteria become “don’t break production,” which doesn’t actually test whether the security controls are effective. It’s not for lack of trying, but traditional methods—such as compliance audits and penetration tests—don’t fully answer the question, “Would we win?” if attacked. As a result, blind spots persist. Traditional Security Testing Falls Short Compliance audits focus on policy and process but rarely engage in operational assurance testing that confirms, “Does this actually work as expected?” Answering “Do you have antivirus software?” is very different from “How long does it take for a malicious file to be removed and your team to be alerted?” Penetration tests can highlight security gaps but often reflect a specific attack path chosen by the testers rather than a comprehensive evaluation of all potential failure points. The end result? Gaps (or blind spots) that typically aren’t discovered until someone else finds them for you. Five Most Common Reasons Security Controls Fail Failures occur in both security tools—such as Secure Email Gateways (SEGs), Endpoint Detection and Response (EDR), and Security Information and Event Management (SIEM) systems—and in security teams, whether in-house or managed detection and response (MDR) providers. We can categorize these into organizations threat prevention, detection, and response investments. A Case Study: How a Leading Healthcare System Proactively Removed Security Control Failures Learn how OnDefend’s BlindSPOT breach and attack simulation (BAS) managed service helped a major U.S. healthcare provider validate security controls, hold vendors accountable, reduce risk and protect patient data. Top Five Causes of Threat Prevention, Detection, and Response Failures Real-World Example A customer had added some new data sources to the collected telemetry, these new logs coming from end-user devices across the fleet.  The sudden increase in logging overwhelmed the SIEM (Security Information and Event Management) system they had, creating a massive backlog of logs to be processed.  The alerts they were looking for would arrive – 6 hours after the event had occurred. It was only when automated testing was introduced that this issue was discovered. Real-World Example An organization hired a third party for security monitoring, including a network IDS analyzing traffic from core routers. After an attack went undetected, they asked the vendor why—only to learn a network change months earlier had cut off traffic to the IDS. Despite receiving no data for months, it never triggered an alert or error. The Need for Continuous Validation The only way to combat these failures is by regularly testing security detection processes. To scale this effectively, control tests must be automated pointing out defects while cataloging successes and calculating key metrics such as Mean Time to Detect (MTTD) and Mean Time to Respond (MTTR). Transitioning Continuous Testing Mindset Managed Breach & Attack Simulation (BAS) services provide ongoing assurance without adding operational burden. When combined with penetration testing, BAS ensures a more comprehensive security strategy. Holding vendors accountable is another key step—continuous testing provides data-driven evidence to measure vendor performance against SLAs, helping organizations demand better service, renegotiate contracts, or compare solutions before making purchasing decisions. Lastly, security leaders must communicate their effectiveness in business terms, using metrics like detection rates, response times, and financial risk reduction to quantify security’s value and in some cases leverage that data to lower cyber insurance premiums. Trust but Verify Your Security Investments Will Work Security leaders have always sought assurance that their cybersecurity investments perform as intended. With corporate stakeholders demanding measurable proof, continuous security validation bridges security, risk reduction, and business objectives—turning cybersecurity from a cost center into a strategic enabler. OnDefend’s Ransomware Defense Validation managed service enables security teams to continuously test and validate their security controls, ensuring real-time visibility into potential blind spots. Don’t let the bad guys do the validating for you. Stop assuming your controls will work—prove it. See the difference continuous validation can make within your security program. Learn More About a Customized Defense Validation Program. Sponsored and written by OnDefend.