CVE-2018-0484: Cisco IOS

Medium severity, CVSS 6.5. EPSS: 0.8% chance of exploitation in the next 30 days.

A vulnerability in the access control logic of the Secure Shell (SSH) server of Cisco IOS and IOS XE Software may allow connections sourced from a virtual routing and forwarding (VRF) instance despite the absence of the vrf-also keyword in the access-class configuration. The vulnerability is due to a missing check in the SSH server. An attacker could use this vulnerability to open an SSH connection to an affected Cisco IOS or IOS XE device with a source address belonging to a VRF instance. Once connected, the attacker would still need to provide valid credentials to access the device.

Affected products

• Cisco IOS: version 16.6.2 only; version 16.6.4 only

Published 2019-01-10. Last modified 2026-06-17.