"...according to an advisory by US federal agencies obtained by CNN..."
I no longer trust any "US federal agencies" any more.
And I certainly don't trust any who served as unnamed sources for the likes of CNN.
I don't trust the Cybersecurity and Infrastructure Security Agency
I do NOT trust the FBI
And I DAMN well do not trust "other agencies". Not one. Not a single one.
They have all shown themselves, when they aren't openly tyrannical or antithetical to any kind of conservative principle or anything GOOD for American, to be at the very least, incompetent, statist government money suck holes more interested in getting a government paycheck than actually doing their jobs that may or may not even benefit taxpayers.