An Uncontrolled Resource Consumption vulnerability in the aftmand process of Juniper Networks Junos OS Evolved allows an unauthenticated, network-based attacker to consume memory resources, resulting in a Denial of Service (DoS) condition. The processes do not recover on their own and must be manually restarted.

This issue affects both IPv4 and IPv6. 

Changes in memory usage can be monitored using the following CLI command:
user@device> show system memory node <fpc slot> | grep evo-aftmann

This issue affects Junos OS Evolved: 

• All versions before 21.2R3-S8-EVO, 
• 21.3 versions before 21.3R3-S5-EVO, 
• 21.4 versions before 21.4R3-S5-EVO, 
• 22.1 versions before 22.1R3-S4-EVO, 
• 22.2 versions before 22.2R3-S4-EVO,
• 22.3 versions before 22.3R3-S3-EVO,
• 22.4 versions before 22.4R2-S2-EVO, 22.4R3-EVO, 
• 23.2 versions before 23.2R1-S1-EVO, 23.2R2-EVO.

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

Junos OS Evolved: 21.2R3-S8-EVO, 21.3R3-S5-EVO, 21.4R3-S5-EVO, 22.1R3-S4-EVO, 22.2R3-S4-EVO, 22.3R3-S3, 22.4R2-S2-EVO, 22.4R3-EVO, 23.2R1-S1-EVO, 23.2R2-EVO, 23.4R1-EVO, and all subsequent releases.

This issue is being tracked as 1754112 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).

There are no known workarounds for this issue.

To reduce the risk of impact avoid high volume of unresolved address resolutions (ARP/NDP) can significantly reduce exposure to this problem.

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