CVE-2020-1666: Juniper Junos OS Evolved

Medium severity, CVSS 6.6. EPSS: 0.3% chance of exploitation in the next 30 days.

The system console configuration option 'log-out-on-disconnect' In Juniper Networks Junos OS Evolved fails to log out an active CLI session when the console cable is disconnected. This could allow a malicious attacker with physical access to the console the ability to resume a previous interactive session and possibly gain administrative privileges. This issue affects all Juniper Networks Junos OS Evolved versions after 18.4R1-EVO, prior to 20.2R1-EVO.

Affected products

• Juniper Junos OS Evolved: version 19.2 only; version 19.3 only; version 19.4 only; version 20.1 only

Published 2020-10-16. Last modified 2026-06-17.