CVE-2020-3205: Cisco IOS

High severity, CVSS 8.8. EPSS: 1% chance of exploitation in the next 30 days.

A vulnerability in the implementation of the inter-VM channel of Cisco IOS Software for Cisco 809 and 829 Industrial Integrated Services Routers (Industrial ISRs) and Cisco 1000 Series Connected Grid Routers (CGR1000) could allow an unauthenticated, adjacent attacker to execute arbitrary shell commands on the Virtual Device Server (VDS) of an affected device. The vulnerability is due to insufficient validation of signaling packets that are destined to VDS. An attacker could exploit this vulnerability by sending malicious packets to an affected device. A successful exploit could allow the attacker to execute arbitrary commands in the context of the Linux shell of VDS with the privileges of the root user. Because the device is designed on a hypervisor architecture, exploitation of a vulnerability that affects the inter-VM channel may lead to a complete system compromise. For more information about this vulnerability, see the Details section of this advisory.

Affected products

• Cisco IOS: version 12.2(60)ez16 only; version 15.0(2)sg11a only; version 15.2(4)jaz1 only; version 15.3(3)jaa1 only; version 15.3(3)jpi only; version 15.3(3)jpj only; …

Published 2020-06-03. Last modified 2026-06-17.