CVE-2026-20177
MediumCVSS 5.3Summary
A vulnerability in the handling of management plane packets by Cisco Industrial Ethernet 1000 Series Switches allows an unauthenticated remote attacker to cause the device manager, SSH, or API to become inaccessible. The issue is due to insufficient protection against management plane flooding attacks.
Risk Assessment
An attacker can cause CPU spikes and denial of service (DoS) for the management interface, SSH, or API, hindering device administration, while data traffic remains unaffected.
Recommendation
Apply vendor updates, restrict access to the management plane, and configure DoS protection mechanisms.
Original NVD description (English source)
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.