The bottom line: Russian intelligence-directed cyber units are exploiting misconfigured network infrastructure worldwide to breach critical infrastructure.
The National Cyber Security Centre (NCSC) and international partners are warning critical sectors of targeted attacks by Russian state actors who are using poorly configured routers as entry points.
The NCSC has issued a new security alert documenting how Russian state cyber actors are systematically exploiting misconfigured routers in organisations operating critical infrastructure worldwide. The attackers leverage these security gaps to gain network access and move undetected.
The alert was issued in coordination with partner agencies from several allied nations and is directed at operators of systems in sectors such as energy, water, transport and healthcare. The core issue lies in the misconfiguration of network routers – a frequently underestimated attack vector.
For CISOs, this means that fundamental hardening measures on the network perimeter must be prioritised. Specifically, these include: regular review of router configurations, disabling unnecessary services, applying patch management and implementing strict access controls. Administrator accounts with default passwords and outdated firmware versions are particularly critical.
The alert underscores the ongoing threat from intelligence-directed cyber operations against Western infrastructure and reveals an established pattern: state actors invest time in reconnaissance and gaining access in order to monitor networks long-term or prepare for escalation.
Source: www.ncsc.gov.uk · Published 13 July 2026
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