Improper Handling of Exceptional Conditions in Ethernet interface frame processing of Juniper Networks Junos OS allows an attacker to send specially crafted frames over the local Ethernet segment, causing the interface to go into a down state, resulting in a Denial of Service (DoS) condition. The interface does not recover on its own and the FPC must be reset manually. Continued receipt and processing of these frames will create a sustained Denial of Service (DoS) condition.

This issue is platform-specific and affects the following platforms and line cards:

• MPC7E/8E/9E and MPC10E on MX240, MX480, MX960, MX2008, MX2010, and MX2020
• MX204, MX10003, MX10008, MX10016
• EX9200, EX9251
• SRX4600

No other products or platforms are affected by this vulnerability.

An indication of this issue occurring can be seen in the system log messages, as shown below:

and interface will be in a permanently down state:

This issue affects Juniper Networks Junos OS:

• 16.1 versions prior to 16.1R7-S7 on MX Series;
• 17.1R1 and later versions prior to 17.2R3-S3 on MX Series;
• 17.3 versions prior to 17.3R3-S8 on MX Series;
• 17.4 versions prior to 17.4R2-S11, 17.4R3-S1 on MX Series, SRX4600;
• 18.1 versions prior to 18.1R3-S10 on MX Series, EX9200 Series, SRX4600;
• 18.2 versions prior to 18.2R3-S3 on MX Series, EX9200 Series, SRX4600;
• 18.3 versions prior to 18.3R3-S1 on MX Series, EX9200 Series, SRX4600;
• 18.4 versions prior to 18.4R2-S3, 18.4R3 on MX Series, EX9200 Series, SRX4600;
• 19.1 versions prior to 19.1R2-S1, 19.1R3 on MX Series, EX9200 Series, SRX4600;
• 19.2 versions prior to 19.2R1-S3, 19.2R2 on MX Series, EX9200 Series, SRX4600;
• 19.3 versions prior to 19.3R2 on MX Series, EX9200 Series, SRX4600.

This issue does not affect Juniper Networks Junos OS versions prior to 16.1R1.

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-2021-0290 .
 

The following software releases have been updated to resolve this specific issue: Junos OS 16.1R7-S7, 17.2R3-S3, 17.3R3-S8, 17.4R2-S11, 17.4R3-S1, 17.4R3-S5, 18.1R3-S10, 18.2R3-S3, 18.2R3-S8, 18.3R3-S1, 18.4R2-S3, 18.4R3, 19.1R2-S1, 19.1R3, 19.2R1-S3, 19.2R2, 19.3R2, 19.4R1, and all subsequent releases.

This issue is being tracked as  1463015 .
 

Software releases or updates are available for download at https://support.juniper.net/support/downloads/
 

2021-07-14: 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 Vulnerability - How to Contact the Juniper Networks Security Incident Response Team
• CVE-2021-0290: Ethernet interface vulnerable to specially crafted frames