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2020-04 Security Bulletin: Junos OS: EX and QFX Series: Console port authentication bypass vulnerability (CVE-2020-1618)



Article ID: JSA11001 SECURITY_ADVISORIES Last Updated: 08 Apr 2020Version: 1.0
Product Affected:
This issue affects Junos OS 14.1X53, 15.1, 15.1X53, 16.1, 17.1, 17.2, 17.3, 17.4, 18.1, 18.2, 18.3. Affected platforms: EX and QFX Series.

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.

Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

This issue was found during internal product security testing or research.

This issue has been assigned CVE-2020-1618.


The following software releases have been updated to resolve this specific issue: 14.1X53-D53, 15.1X53-D593, 15.1R7-S4, 16.1R7-S4, 17.1R2-S11, 17.1R3-S1, 17.2R3-S3, 17.3R2-S5, 17.3R3-S6, 17.4R2-S9, 17.4R3, 18.1R3-S8, 18.2R2, 18.3R1-S7, 18.3R2, 18.4R1, and all subsequent releases.

This issue is being tracked as 1378429 and 1368940.


Limit physical access to the console port only to trusted administrators.

Software Releases, patches and updates are available at
Modification History:
‚Äč2020-04-08: Initial publication
CVSS Score:
6.3 (CVSS:3.1/AV:P/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H)
Severity Level:
Severity Assessment:
Information for how Juniper Networks uses CVSS can be found at KB 16446 "Common Vulnerability Scoring System (CVSS) and Juniper's Security Advisories."

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