Luxembourg Probes Cyberattack Behind Telecom Outage, Cites “Exceptionally Sophisticated” Assault

The Luxembourg government has launched a formal investigation into a major nationwide telecom outage that occurred on July 23, following what officials say was a deliberate cyberattack. The disruption, which lasted over three hours, knocked out the country’s 4G and 5G mobile networks, severely hampering internet access, emergency service communications, and electronic banking.

Authorities revealed that the fallback 2G network was overwhelmed, leaving significant portions of the population unable to make emergency calls. “The attack was designed to be disruptive, not to compromise or infiltrate systems,” officials clarified in statements made to the national parliament.

The vulnerability was traced to a “standardised software component” utilized by POST Luxembourg—the state-owned telecom operator responsible for most of the country’s network infrastructure. Luxembourg’s national alert system also failed during the incident, as it relied on the same mobile infrastructure for communication.

POST’s Director-General characterized the cyberattack as “exceptionally advanced and sophisticated,” emphasizing that internal systems and user data were not breached. Both POST and the national Computer Security Incident Response Team (CSIRT) are currently conducting a thorough forensic analysis to determine the exact vector of

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