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2021-04 Security Bulletin: Junos OS: SRX1500, SRX4100, SRX4200, SRX4600, SRX5000 Series with SPC2/SPC3: In a multi-tenant environment, a tenant host administrator may be able to jailbreak out of their network impacting other tenant networks or gather information from other networks. (CVE-2021-0246)



Article ID: JSA11139 SECURITY_ADVISORIES Last Updated: 14 Apr 2021Version: 3.0
Product Affected:
This issue affects Junos OS 18.3, 18.4, 19.1. Affected platforms: SRX1500, SRX4100, SRX4200, SRX4600, SRX5000 Series with SPC2, SRX5000 Series with SPC2/SPC3.

On SRX1500, SRX4100, SRX4200, SRX4600, SRX5000 Series with SPC2/SPC3, devices using tenant services on Juniper Networks Junos OS, due to incorrect default permissions assigned to tenant system administrators a tenant system administrator may inadvertently send their network traffic to one or more tenants while concurrently modifying the overall device system traffic management, affecting all tenants and the service provider. Further, a tenant may inadvertently receive traffic from another tenant.

This issue affects:

Juniper Networks Junos OS:

  • 18.3 version 18.3R1 and later versions on SRX1500, SRX4100, SRX4200, SRX4600, SRX5000 Series with SPC2;
  • 18.3 versions prior to 18.3R3 on SRX1500, SRX4100, SRX4200, SRX4600, SRX5000 Series with SPC2;
  • 18.4 versions prior to 18.4R2 on SRX1500, SRX4100, SRX4200, SRX4600, SRX5000 Series with SPC2/SPC3;
  • 19.1 versions prior to 19.1R2 on SRX1500, SRX4100, SRX4200, SRX4600, SRX5000 Series with SPC2/SPC3.

This issue does not affect Juniper Networks Junos OS versions prior to 18.3R1.

Only one tenant configuration and login class must be enabled for this issue to be seen between the tenant and root or multiple tenants, for example:

system login class "tenant class" tenant "tenant"
system login user "user" uid "id"
system login user "user" class "tenant class"
tenants "tenant" interfaces
tenants "tenant" routing-instances
system security-profile "tenant profile" policy maximum "number"
system security-profile "tenant profile" zone maximum "number"
system security-profile "tenant profile" tenant "tenant"
tenants "tenant" security policies default-policy deny-all

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

This issue was seen during production usage.

This issue has been assigned CVE-2021-0246.


The following software releases have been updated to resolve this specific issue: Junos OS: 18.3R3, 18.4R2, 19.1R2, 19.2R1, and all subsequent releases.

This issue is being tracked as 1422058.


There are no known workarounds for this issue

Software releases or updates are available for download at
Modification History:
2021-04-14: Initial Publication.
CVSS Score:
7.3 (CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:L/I:H/A:L)
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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