OPM Data Breach

In 2015, the U.S. Office of Personnel Management (OPM) experienced one of the largest and most damaging data breaches in government history. Attackers gained unauthorized access to OPM systems and exfiltrated highly sensitive data belonging to approximately 21.5 million current, former, and prospective federal employees. The stolen information included Social Security numbers, addresses, birth dates, background investigation records, and even fingerprint data. The breach exposed deeply personal and security-relevant information, making it a major national security concern and highlighting severe weaknesses in federal cybersecurity practices.

The OPM breach was the result of long-standing security failures rather than a single exploit. Attackers were able to remain inside the network for over 11 months undetected, indicating poor monitoring and detection capabilities. The environment lacked basic cybersecurity controls, including multi-factor authentication, strong access controls, and proper network segmentation.

Critical systems were also outdated and unpatched, creating exploitable vulnerabilities. Sensitive databases were not encrypted, allowing attackers to access and extract data in plain form. Additionally, weak credential security enabled attackers to move laterally across systems. Leadership failures played a major role, as warnings about these weaknesses had been raised for years but not adequately addressed.

Relevant articles and reports on the OPM data breach:

https://en.wikipedia.org/wiki/Office_of_Personnel_Management_data_breach https://www.csoonline.com/article/3201041/data-breach/the-opm-data-breach-2-years-on-what-government-agencies-must-do-now.html https://www.tripwire.com/state-of-security/the-opm-breach-timeline-of-a-hack