The threat actor, known as BlackTech, has “compromised several Cisco routers using variations of a customized firmware backdoor,” the agencies said in the advisory. The hackers have been known ...

The safest way to perform the firmware upgrade is to use a wired computer via web UI or Cisco Connect Setup tool. DO NOT power cycle the Router during the firmware upgrade process.

The actively exploited vulnerability impacts any switch or router running IOS XE and ... a widely used Cisco networking software platform, “when exposed to the internet or to untrusted networks.” ...