Government cybersecurity agencies have warned that Russian state-backed hackers are targeting vulnerable routers to gain long-term access to critical infrastructure networks.
The joint advisory says attackers are exploiting internet-facing network devices to collect sensitive information, map internal systems, and prepare future cyber operations. Security officials are urging organizations to strengthen router security before these devices become entry points into larger networks.
Russian Router Attacks Focus on Edge Devices
The warning was issued by the US Cybersecurity and Infrastructure Security Agency (CISA), the FBI, the NSA, DC3, and cybersecurity authorities from eight partner nations.
According to the advisory, Russian state-sponsored groups continue to target internet-facing routers because they often receive less attention than traditional computers and servers.
Instead of relying on advanced zero-day exploits, attackers frequently succeed by abusing weak configurations, outdated firmware, default credentials, and legacy management protocols.
Router Configuration Files Offer Valuable Intelligence
Security experts say compromised routers can reveal far more than network traffic.
According to Ensar Seker, President of Research and CISO at SOCRadar, router configuration files often contain valuable intelligence. These files may expose administrative credentials, VPN settings, internal IP ranges, network topology, access-control rules, and trusted connections.
As a result, attackers can map a victim’s environment, identify high-value systems, and maintain hidden access for future operations.
One Vulnerable Router Can Expose an Entire Network
CISA says routers should be treated as critical security assets rather than passive networking equipment.
A single compromised edge device can give attackers a platform for espionage, lateral movement, or disruptive cyberattacks. Because routers often sit outside standard endpoint security tools, malicious activity can remain undetected for long periods.
The advisory highlights several sectors that face elevated risk, including:
- Communications
- Defense
- Energy
- Financial services
- Government
- Healthcare
- Public health
State and local government organizations also remain frequent targets.
Russian Threat Groups Continue Targeting Networks
The advisory links the activity to several Russian state-backed threat groups that have previously targeted government agencies and critical infrastructure.
Among the groups named are:
- Berserk Bear
- Energetic Bear
- Crouching Yeti
- Dragonfly
- Ghost Blizzard
- Static Tundra
These groups are known for exploiting exposed network infrastructure to establish persistent access before launching broader cyber campaigns.
Security Agencies Recommend Stronger Router Protection
Officials are encouraging organizations to review every internet-facing network device.
Recommended steps include upgrading to SNMPv3, removing default community strings, restricting remote management access, disabling unnecessary services, applying firmware updates, and monitoring configuration changes.
In addition, security teams should maintain an up-to-date inventory of routers and other network appliances to reduce forgotten or unmanaged devices.
EU Expands Sanctions Against Russia-Linked Cyber Actors
The warning coincides with new sanctions announced by the Council of the European Union.
The latest measures target nine individuals and four organizations accused of supporting cyberattacks against EU member states, the United States, and international partners.
Among those sanctioned are hosting provider Media Land LLC, its owner Alexander Volosovik, and sister company ML.Cloud.
The sanctions also cover several Russia-linked cyber groups and malware operations, including Z-Pentest, Cyber Army of Russia Reborn (CARR), GRU Unit 29155, LummaC2, TrickBot, and the Conti ransomware operation.
As governments increase pressure on Russia’s cyber ecosystem, security agencies continue to stress that basic network hygiene remains one of the strongest defenses against state-sponsored intrusions.
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