CVE-2020-1666: Junos OS Evolved: 'console log-out-on-disconnect' fails to terminate session on console cable disconnection

Severity: high (CVSS 7.2 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-10-16 · updated 2026-06-17
Weakness: CWE-284

Description

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 Networks Junos OS Evolved: 19.2-r1, 19.2-r2, 19.3-r2, 19.4-r1, 19.4-r2, 19.4-r2-s1 (+1)

References

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