A Huawei enterprise router flaw reportedly caused Luxembourg’s 2025 nationwide telecom outage, which affected landline, 4G/5G and emergency services for more than three hours after specially crafted traffic forced network devices into continuous reboot loops. Attackers used crafted network traffic to drive the Huawei devices into endless reboots, crashing key parts of POST Luxembourg’s telecom infrastructure.
An attack exploiting a previously unknown vulnerability in Huawei enterprise router software caused a nationwide telecoms outage in Luxembourg last year, according to the report published by The Record Media.
Paul Rausch, the head of communications at POST Luxembourg, described the incident as a denial-of-service attack targeting a network device and said it exploited a non-public, non-documented behaviour for which no patch was available at the time, and was not related to exploitation of any known vulnerabilities. Investigators found that corrupted traffic may have triggered the disruption, and evidence suggested no specific intent against POST and no public CVE was issued or advisory released. No similar attacks were observed afterward, and Huawei reportedly had no immediate fix at the time. according to The Record Media