An Allocation of Resources Without Limits or Throttling vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS allows a network-based, unauthenticated attacker to cause a Denial of Service (DoS).
 

On QFX10K Series, Inter-Chassis Control Protocol (ICCP) is used in MC-LAG topologies to exchange control information between the devices in the topology. ICCP connection flaps and sync issues will be observed due to excessive specific traffic to the local device.
 

This issue affects Juniper Networks Junos OS on QFX10K Series:

• All versions prior to 20.2R3-S7;
• 20.4 versions prior to 20.4R3-S4;
• 21.1 versions prior to 21.1R3-S3;
• 21.2 versions prior to 21.2R3-S1;
• 21.3 versions prior to 21.3R3;
• 21.4 versions prior to 21.4R3;
• 22.1 versions prior to 22.1R2.

To be exposed to this issue a minimal ICCP configuration like the following needs to be present:

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-2023-22403.

The following software releases have been updated to resolve this specific issue: 20.2R3-S7, 20.4R3-S4, 21.1R3-S3, 21.2R3-S1, 21.3R3, 21.4R3, 22.1R2, 22.2R1, and all subsequent releases.
 

This issue is being tracked as 1640483.

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

• 2023-01-11: Initial Publication

• 2023-08-08: Explicitly state "QFX10K Series" in Problem section

• 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-2023-22403 at cve.mitre.org