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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.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Cisco Ios | — | Upgrade to the latest version of Cisco IOS to resolve this vulnerability | Jan 10, 2019 | Jan 10, 2019 |
| Cisco Xe | — | Upgrade to the latest version of Cisco IOS XE | Jul 30, 2019 | Jan 10, 2019 |
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