Why do we keep talking about AI, cloud, and quantum, when the real threat is still that old server in the basement? This study explores the persistent threat posed by legacy environments, emphasizing their status as active vulnerability zones due to unpatched flaws, insufficient vendor support, and outdated security controls. Using a simulated breach scenario on end-of-life Red Hat 5 servers, we illustrate how advanced persistent threats (APTs) exploit known vulnerabilities such as Shellshock and outdated encryption implementations to infiltrate networks and exfiltrate sensitive research data. The findings underscore the high likelihood and impact of such attacks, driven by institutional reliance on obsolete systems and insufficient defensive measures. To address these risks, we propose a lifecycle-based mitigation framework comprising six key dimensions: Time, Scope, Change, Vendor, Process, and Data. Each dimension is translated into SMART actions to enable proactive risk management and structured governance. By adopting this artefact, institutions can phase out legacy systems methodically, reduce long-term exposure, and align with broader security and compliance standards. Ultimately, this research advocates a shift from reactive firefighting to disciplined lifecycle hygiene to ensure resilience in an era of escalating cyber threats.