An Uncontrolled Resource Consumption vulnerability in the H.323 ALG (Application Layer Gateway) of  Juniper Networks Junos OS on SRX Series and MX Series with SPC3 and MS-MPC/MIC, allows an unauthenticated network-based attacker to send specific packets causing traffic loss leading to Denial of Service (DoS). 

Continued receipt and processing of these specific packets will sustain the Denial of Service condition.

The memory usage can be monitored using the below command.

  user@host> show usp memory segment sha data objcache jsf 

This issue affects SRX Series and MX Series with SPC3 and MS-MPC/MIC: 

•  20.4 before 20.4R3-S10, 
•  21.2 before 21.2R3-S6, 
•  21.3 before 21.3R3-S5, 
•  21.4 before 21.4R3-S6, 
•  22.1 before 22.1R3-S4, 
•  22.2 before 22.2R3-S2, 
•  22.3 before 22.3R3-S1, 
•  22.4 before 22.4R3, 
•  23.2 before 23.2R2.

The following software releases have been updated to resolve this specific issue:

Junos OS: 20.4R3-S10, 21.2R3-S6, 21.3R3-S5, 21.4R3-S6, 22.1R3-S4, 22.2R3-S2, 22.3R3-S1, 22.4R3, 23.2R2, 23.4R1, and all subsequent releases.

This issue is being tracked as 1745890 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).

2024-07-10: Initial Publication
2024-09-13: Minor formatting change to CVSS field

• 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