A Use After Free vulnerability in the Advanced Forwarding Toolkit (AFT) manager process (aftmand) of Juniper Networks Junos OS allows an unauthenticated networked attacker to cause a kernel crash due to intensive polling of Abstracted Fabric (AF) interface statistics and thereby a Denial of Service (DoS). Continued gathering of AF interface statistics will create a sustained Denial of Service (DoS) condition.
 

This issue affects Juniper Networks Junos OS on MX Series:

• 20.1 versions later than 20.1R1;
• 20.2 versions prior to 20.2R3-S5;
• 20.3 versions prior to 20.3R3-S4;
• 20.4 versions prior to 20.4R3;
• 21.1 versions prior to 21.1R2;
• 21.2 versions prior to 21.2R2.

For this issue to exist the following configuration is required:

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-2022-22207.
 

The following Junos OS software releases have been updated to resolve this specific issue Junos OS: 20.2R3-S5, 20.3R3-S4, 20.4R3, 21.1R2, 21.2R2, 21.3R1, and all subsequent releases.
 

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

This issue is being tracked as 1602531.
 

There are no viable workarounds for this issue.
 

To reduce the risk of exploitation of this issue, use access lists or firewall filters to limit access to only trusted networks, hosts and users.
 

2022-07-13: 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