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Attackers Abuse Milesight Routers to Send Smishing SMS

📱 SEKOIA warns that unknown actors have been abusing Milesight industrial cellular routers to send phishing SMS messages across Europe since at least February 2022. The attackers exploited exposed SMS-related APIs — linked to a patched information disclosure flaw (CVE-2023-43261) — to dispatch typosquatted URLs impersonating government platforms, banks, postal and telecom providers. Of roughly 18,000 such routers visible on the public internet, SEKOIA identified about 572 potentially vulnerable devices, roughly half located in Europe. The campaigns used JavaScript-based mobile checks and domains that disabled debugging and logged visitors to a Telegram bot, indicating operational measures to hinder analysis.

Smishing Campaigns Abuse Milesight Cellular Routers

📩 Research from Sekoia.io’s TDR team reveals a wave of smishing attacks that abused APIs on Milesight Industrial Cellular Routers to send phishing SMS, primarily targeting Belgian users by impersonating government services such as CSAM and eBox. The activity was first detected on 22 July 2025 via honeypots, and investigators found messages in Dutch and French using Belgium’s +32 code. Sekoia noted over 19,000 devices are publicly accessible and at least 572 permit unauthenticated SMS access, enabling large-scale abuse. The campaigns used infrastructure linked to Podaon and domains often registered through NameSilo, with attackers testing compromised routers before launching mass waves.