A Missing Release of Memory after Effective Lifetime vulnerability in the Routing Protocol Daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated, network-based attacker to cause a Denial of Service (DoS).

In a Juniper Flow Monitoring (jflow) scenario route churn that causes BGP next hops to be updated will cause a slow memory leak and eventually a crash and restart of rpd.

Thread level memory utilization for the areas where the leak occurs can be checked using the below command:

This issue affects:

Junos OS

• 21.4 versions earlier than 21.4R3;
• 22.1 versions earlier than 22.1R3;
• 22.2 versions earlier than 22.2R3.

Junos OS Evolved

• 21.4-EVO versions earlier than 21.4R3-EVO;
• 22.1-EVO versions earlier than 22.1R3-EVO;
• 22.2-EVO versions earlier than 22.2R3-EVO.

This issue does not affect:

• Juniper Networks Junos OS versions earlier than 21.4R1.
• Juniper Networks Junos OS Evolved versions earlier than 21.4R1.

This issue only happens when jflow is configured:

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-2024-21611.

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

Junos OS: 21.4R3, 22.1R3, 22.2R3, 22.3R1, and all subsequent releases.

Junos OS Evolved: 21.4R3-EVO, 22.1R3-EVO, 22.2R3-EVO, 22.3R1-EVO, and all subsequent releases.

This issue is being tracked as PR 1681394 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).

2024-01-10: 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-2024-21611 at cve.mitre.org