Deutsche Glasfaser operates Germany's largest rural fiber-optic infrastructure, managing approximately 2.5 million FTTH connections across more than 1,750 municipalities. Backed by over €10 billion in private investment from EQT and OMERS, the company plans, builds, and operates open-access fiber networks serving residential, business, and public-sector customers - around 1.5 million contracted endpoints at scale. The threat surface spans operational technology for network management, customer data across a distributed footprint, and the attack vectors inherent in managing critical telecommunications infrastructure.
The security stack centers on Microsoft Defender for Endpoint and Sentinel for detection and response, with Tenable handling vulnerability management and a SIEM correlating events across the environment. Engineering workflows run through Atlassian tooling - JIRA, Confluence, and ScriptRunner - creating integration points that require hardening. The operational model demands securing both the physical network construction process and the digital service layer, with particular attention to supply chain integrity in hardware deployment and access control across a geographically dispersed infrastructure.
Under CEO Andreas Pfisterer, the company positions itself as a technology leader in cost-efficient FTTH expansion, which translates to velocity pressures on security architecture. Defending rural broadband infrastructure means balancing rapid rollout demands against the need for consistent security controls across municipalities with varying maturity levels. The open-access model introduces shared responsibility boundaries with service providers using the network, requiring clear threat models for multi-tenant environments and robust monitoring at handoff points.
