CVE-2020-1666

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

MEDIUM
6.6
CVSS Score
Published: October 16, 2020 at 08:31 PM UTC
Updated: June 17, 2026 at 03:02 AM UTC
2 products affected across 2 vendorsJunos OS EvolvedJunos OS Evolved

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Severity
MEDIUM6.6
Exploit prediction
EPSS 0.3%

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 20.2R1-EVO
Vendor states this is fixed in 18.4R1-EVO (unaffected)
Affected range stops below 20.2R1-EVO, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

x_refsource_CONFIRMVendor Advisory
https://kb.juniper.net/JSA11063

CVSS

6.6MEDIUMjuniper
Attack Vector
PHYSICAL
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-284CWE-613

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