Medium [CVE-2026-20177] Cisco Industrial Ethernet 1000 Series Switches Denial of Service Vulnerability
This medium-severity Cisco advisory covers CVE-2026-20177 affecting Industrial Ethernet Switches.
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Summary
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.
Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.
Affected product named by the advisory: Industrial Ethernet Switches.
- Scope: At the time of publication, this vulnerability affected Cisco IE 1000 Series Switches, regardless of device configuration.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Mitigation checklist
- There are no workarounds that address this vulnerability.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
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