"This is a global threat", said top DHS official, Jeanette Manfra.
Officials said they had "high confidence" that the Russian government was behind the campaign.
The warning is unrelated to the administration's recent military strikes on suspected chemical weapons facilities in Syria, action Russian Federation condemned.
It's warned that a Russian government campaign to exploit these devices threatens safety, security, and economic well-being of the U.S. and the UK.
"When we see malicious cyber activity, whether it be from the Kremlin or other malicious actors, we're going to push back", Joyce said.
The joint statement by the DHS, FBI and NCSC said multiple sources including private and public-sector research organisations, as well as other nations, have reported this activity to the United States and United Kingdom governments.
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Monday's announcement is the latest in a series of related moves by the Trump administration, which in recent months has publicly blamed Russian Federation for launching the NotPetya worm that has been characterised as the costliest and most destructive cyberattack in history.
The "purpose of these attacks could be espionage, it could be the theft of intellectual property, and of course, it could be pre-positioning for use in times of tension", said Ciaran Martin, Chief Executive of the UK's National Cyber Security Centre (NCSC).
"Extracted configuration files may contain sensitive information, such as device administrative credentials, and could be used to compromise the router/switch and enable targeting of other devices on the network". "Most or all organizational and customer traffic must traverse these critical devices".
Looks like it's time to change the default password on your router, especially if you operate a home office.
The agencies, which include the Federal Bureau of Investigation, do not know precisely how many routers, firewalls and switches have been compromised and to what extent. It had also let attackers cripple firewalls and intrusion detection systems that organizations use to flag malicious internet traffic, according to the BBC.
"We can't rule out that Russian Federation might intend to use this set of compromises for future offensive cyber operations as well, it provides basic infrastructure they can launch from".