Receipt of a malformed packet on MX Series devices with dynamic vlan configuration can trigger an uncontrolled recursion loop in the Broadband Edge subscriber management daemon (bbe-smgd), and lead to high CPU usage and a crash of the bbe-smgd service. Repeated receipt of the same packet can result in an extended denial of service condition for the device.

Affected releases are Juniper Networks Junos OS:

• 16.1 versions prior to 16.1R7-S1;
• 16.2 versions prior to 16.2R2-S7;
• 17.1 versions prior to 17.1R2-S10, 17.1R3;
• 17.2 versions prior to 17.2R3;
• 17.3 versions prior to 17.3R3-S1;
• 17.4 versions prior to 17.4R2;
• 18.1 versions prior to 18.1R3;
• 18.2 versions prior to 18.2R2.

This issue can only occur on MX Series devices with dynamic vlan configuration.

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-2019-0001 .

The following Junos OS releases have been updated to resolve this specific issue: 16.1R7-S1, 16.2R2-S7, 17.1R2-S10, 17.1R3, 17.2R3, 17.3R3-S1, 17.4R2, 18.1R3, 18.2R2, 18.3R1, and all subsequent releases.

This issue is being tracked as PR  1356474  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).

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

There are no viable workarounds for this issue.

• 2019-01-09: Initial Publication.

• KB16613: Overview of the Juniper Networks SIRT Quarterly Security Bulletin Publication Process [juniper.net]
• KB16765: In which releases are vulnerabilities fixed? [juniper.net]
• KB16446: Common Vulnerability Scoring System (CVSS) and Juniper's Security Advisories [juniper.net]
• Report a Security Vulnerability - How to Contact the Juniper Networks Security Incident Response Team