A Missing Release of Memory after Effective Lifetime vulnerability in the rtlogd process of Juniper Networks Junos OS on MX Series with SPC3 allows an unauthenticated, adjacent attacker to trigger internal events cause ( which can be done by repeated port flaps) to cause a slow memory leak, ultimately leading to a Denial of Service (DoS).

Memory can only be recovered by manually restarting rtlogd process. 

The memory usage can be monitored using the below command.

This issue affects Junos OS on MX Series with SPC3 line card: 

• from 21.2R3 before 21.2R3-S8, 
• from 21.4R2 before 21.4R3-S6, 
• from 22.1 before 22.1R3-S5, 
• from 22.2 before 22.2R3-S3, 
• from 22.3 before 22.3R3-S2, 
• from 22.4 before 22.4R3-S1, 
• from 23.2 before 23.2R2, 
• from 23.4 before 23.4R2.

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

Junos OS: 21.2R3-S8, 21.4R3-S6, 22.1R3-S5, 22.2R3-S3, 22.3R3-S2, 22.4R3-S1, 23.2R2, 23.4R2, 24.2R1, and all subsequent releases.

This issue is being tracked as 1779424 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