Alleged Huawei zero-day blamed for the 2025 Luxembourg telecom crash

On July 23, 2025, Luxembourg suffered a nationwide telecom outage allegedly caused by a previously undisclosed flaw in Huawei enterprise routers; specially crafted network traffic triggered continuous reboot loops, disrupting landline, 4G/5G and emergency services for more than three hours. The incident was described as exploiting a non-public/undocumented behavior for which no CVE or public patch had been issued, and investigators did not confirm further exploitation, leaving the scope of exposure and remediation status unclear.