This issue affects Junos OS 16.1, 17.1, 17.2, 17.3, 17.4, 18.1, 18.2 on EX4300 Series.

A vulnerability in the pfe-chassisd Chassis Manager (CMLC) daemon of Juniper Networks Junos OS allows an attacker to cause a Denial of Service (DoS) to the EX4300 when specific valid broadcast packets create a broadcast storm condition when received on the me0 interface of the EX4300 Series device. A reboot of the device is required to restore service. Continued receipt of these valid broadcast packets will create a sustained Denial of Service (DoS) against the device.

Affected releases are Juniper Networks Junos OS:

• 16.1 versions above and including 16.1R1 prior to 16.1R7-S5;
• 17.1 versions prior to 17.1R3;
• 17.2 versions prior to 17.2R3;
• 17.3 versions prior to 17.3R3-S2;
• 17.4 versions prior to 17.4R2;
• 18.1 versions prior to 18.1R3;
• 18.2 versions prior to 18.2R2.

The following minimal configuration is required:

set interfaces me0

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-2019-0046.
 

The following software releases have been updated to resolve this specific issue: 16.1R7-S5, 17.1R3, 17.2R3, 17.3R3-S2, 17.4R2, 18.1R3, 18.2R2, 18.3R1, and all subsequent releases.

This issue is being tracked as PR 1329430 which is visible on the Customer Support website.

Note: Juniper SIRT's policy is not to evaluate releases which are beyond End of Engineering (EOE) or End of Life (EOL).
 

There are no viable workarounds for this issue.
 

Software Releases, patches and updates are available at https://www.juniper.net/support/downloads/.
 

• 2019-07-10: Initial Publication

6.5 (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

Information for how Juniper Networks uses CVSS can be found at KB 16446 "Common Vulnerability Scoring System (CVSS) and Juniper's Security Advisories."