Juniper Junos CVE-2019-0071 Local Security Bypass Vulnerability



Date Discovered

October 9, 2019


Juniper Junos is prone to a local security-bypass vulnerability. Attackers can exploit this issue to bypass certain security restrictions and perform unauthorized actions. Junos OS versions 18.1R3-S4 and 18.3R1-S3 for EX2300, EX2300-C and EX3400 platforms are vulnerable.

Technologies Affected

  • Juniper EX2300 Ethernet Switch
  • Juniper EX2300-C Ethernet Switch
  • Juniper EX3400 Ethernet Switch
  • Juniper Junos 18.1R3-S4
  • Juniper Junos 18.3R1-S3


Permit local access for trusted individuals only. Where possible, use restricted environments and restricted shells.
Permit local interactive access to known and trusted individuals only. Use of restricted environments such as chroot and jail may also limit exposure to this and other latent vulnerabilities.

To limit the consequences of successful exploits, run the server in a closed or restricted environment.
To limit the impact of a successful exploit, run server software with the least privileges required and in restricted environments while still maintaining functionality.

Updates are available. Please see the references or vendor advisory for more information.



The vendor reported this issue.

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