An Improper Check or Handling of Exceptional Conditions within the storm control feature of Juniper Networks Junos OS allows an attacker sending a high rate of traffic to cause a Denial of Service. Continued receipt and processing of these packets will create a sustained Denial of Service (DoS) condition.

Storm control monitors the level of applicable incoming traffic and compares it with the level specified. If the combined level of the applicable traffic exceeds the specified level, the switch drops packets for the controlled traffic types.

This issue affects Juniper Networks Junos OS on QFX10002:

• All versions prior to 19.3R3-S7;
• 19.4 versions prior to 19.4R3-S11;
• 20.2 versions prior to 20.2R3-S6;
• 20.4 versions prior to 20.4R3-S5;
• 21.1 versions prior to 21.1R3-S4;
• 21.2 versions prior to 21.2R3-S3;
• 21.3 versions prior to 21.3R3;
• 21.4 versions prior to 21.4R2.

The following provides an example of an affected configuration:

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

This issue was found during internal product security testing or research.

This issue has been assigned CVE-2023-28965.

The following software releases have been updated to resolve this specific issue: 19.3R3-S7, 19.4R3-S11, 20.2R3-S6, 20.4R3-S5, 21.1R3-S4, 21.2R3-S3, 21.3R3, 21.4R2, 22.1R1 and all subsequent releases.

This issue is being tracked as 1619359

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 known workarounds for this issue.

• 2023-04-12: 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
• CVE-2023-28965 at cve.mitre.org