CVE-2020-8349: Lenovo Cloud Networking Operating System

Critical severity, CVSS 9.8. EPSS: 2.2% chance of exploitation in the next 30 days.

An internal security review has identified an unauthenticated remote code execution vulnerability in Cloud Networking Operating System (CNOS)’ optional REST API management interface. This interface is disabled by default and not vulnerable unless enabled. When enabled, it is only vulnerable where attached to a VRF and as allowed by defined ACLs. Lenovo strongly recommends upgrading to a non-vulnerable CNOS release. Where not possible, Lenovo recommends disabling the REST API management interface or restricting access to the management VRF and further limiting access to authorized management stations via ACL.

Affected products

• Lenovo Cloud Networking Operating System: before 10.10.6.0 (fixed in 10.10.6.0)

Published 2020-10-14. Last modified 2026-06-17.