CVE-2026-20177: Cisco Industrial Ethernet 1000 Series Switches Denial of Service Vulnerability
A vulnerability in the handling of management plane packets by Cisco Industrial Ethernet (IE) 1000 Series Switches could allow an unauthenticated, remote attacker to cause the device manager, SSH, or API to become inaccessible.This vulnerability is due to insufficient protection against management plane flooding attacks. An attacker could exploit this vulnerability by sending a high rate of ICMP, SSH, or HTTP traffic to an affected device. A successful exploit could allow the attacker to cause the CPU of the device to increase, resulting in a denial of service (DoS) condition on the device manager web GUI, SSH, or API. Data traffic through the device is not affected.
Affected Software
Event History
Frequently Asked Questions
Which services can become unavailable during an attack?
The device manager web GUI, SSH, and API can become inaccessible if management-plane CPU usage is driven high. Data traffic passing through the switch is not affected.
What does an attacker need to exploit this issue?
An unauthenticated remote attacker can exploit the issue by sending a high rate of ICMP, SSH, or HTTP traffic to an affected device.