A NULL Pointer Dereference vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS on QFX5000 Series and MX Series allows an unauthenticated adjacent attacker to cause a Denial of Service (DoS).
 

On QFX5K Series and MX Series, when the PFE receives a specific VxLAN packet the Layer 2 Address Learning Manager (L2ALM) process will crash leading to an FPC reboot. Continued receipt of this specific packet will create a sustained Denial of Service (DoS) condition.
 

This issue affects Juniper Networks Junos OS on QFX5000 Series, MX Series:

• 20.3 versions prior to 20.3R3-S3;
• 20.4 versions prior to 20.4R3-S2;
• 21.2 versions prior to 21.2R2-S1.

This issue does not affect Juniper Networks Junos OS:

• All versions prior to 20.3R1;
• 21.1 version 21.1R1 and later versions.

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-2022-22210.
 

The following software releases have been updated to resolve this specific issue: 20.3R3-S3, 20.4R3-S2, 21.2R2-S1, 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 1636853.

 

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