Legacy Systems Are Becoming a Security Risk: Why AI Raises the Pressure to Act
By Emanuel Böminghaus, Legacy Systems Expert and Managing Director, AvenDATA
By Emanuel Böminghaus
Legacy Systems Expert and
Managing Director, AvenDATA
Managing Director, AvenDATA
Legacy Systems Meet a New Generation of Cyberattacks
Legacy systems are older applications and IT platforms that companies keep running even though the underlying technology is outdated or the systems are rarely needed for day-to-day operations. They usually stay active for one simple reason: historical data, records, and business transactions must remain accessible. With the rise of powerful AI models, however, the risk landscape is changing. Attackers can now analyze vulnerabilities faster, automate attack patterns, and process large volumes of technical information far more efficiently. At the same time, many companies have spent years building complex IT environments with numerous interfaces, old user accounts, and poorly documented dependencies. This combination creates a structural problem for CIOs and IT leaders.
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Every system that stays online without a business need expands the attack surface. Companies should therefore systematically review which legacy systems they still need for day-to-day operations and which ones they can permanently decommission through secure archiving.
Why Legacy Systems Pose a Growing Cybersecurity Risk
Old applications don’t just drive up maintenance and licensing costs they can also create significant security risks. Vendors stop issuing updates, operating systems reach end of support, and specialized expertise disappears when employees or service providers leave. Meanwhile, outdated authentication methods, poorly protected interfaces, and permission structures that have grown unchecked over time often remain in place.
Modern AI tools make this situation worse because cyberattacks are becoming increasingly automated and scalable. A forgotten system can quickly become an open door into a company’s wider infrastructure. Compliance risks and operational dependencies add to the problem.
Companies looking to retire legacy systems shouldn’t focus solely on direct operating costs. What matters is the full risk picture, spanning cybersecurity, compliance, staffing requirements, and business continuity. The larger and older the application landscape, the more important a structured decommissioning process becomes.
How to Safely Decommission Legacy Systems Without Losing Data
The challenge is shutting down legacy systems without losing company data that is still needed. This is where professional, audit-compliant data archiving comes in. Data and documents are extracted from the original system and kept accessible on an independent archiving platform for as long as required. The process must take statutory retention periods and other legal requirements into account. At the same time, business units, internal audit teams, and external auditors still need traceable access to relevant historical information. Simply copying databases or permanently virtualizing entire legacy applications is therefore not enough. The goal is to archive legacy data, preserve its business context, and eliminate all technical dependencies on the original system. Only once data access, permissions, traceability, and legal compliance are fully ensured can the original infrastructure be shut down in a controlled, permanent way.
Smaller Attack Surface, Lower Costs, and Stronger Compliance
Systematically decommissioning legacy systems that are no longer needed reduces the complexity of the IT landscape. Servers, databases, interfaces, and old operating systems no longer need to be operated, monitored, patched, or maintained by specialists. This can reduce infrastructure, licensing, and staffing costs while also shrinking the potential attack surface. As AI models grow more powerful, eliminating unnecessary systems is becoming an essential part of any modern cybersecurity strategy.
With AvenDATA and its archiving platform ViewBox, companies can extract historical data and documents from legacy systems, keep them accessible for audits and daily business, and then retire the original applications step by step. This approach combines cost reduction, compliance, and cybersecurity in a single project.
Find out which legacy systems in your IT landscape are still needed and which ones you can archive in an audit-compliant way and retire with confidence. Contact our experts for an initial assessment, or book a web meeting.