In VxLAN scenarios on EX4300-MP, EX4600, QFX5000 Series devices an Uncontrolled Memory Allocation vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS allows an unauthenticated adjacently located attacker sending specific packets to cause a Denial of Service (DoS) condition by crashing one or more PFE's when they are received and processed by the device. 

Upon automatic restart of the PFE, continued processing of these packets will cause the memory leak to reappear. Depending on the volume of packets received the attacker may be able to create a sustained Denial of Service (DoS) condition.

This issue affects:
Juniper Networks Junos OS on EX4300-MP, EX4600, QFX5000 Series:

• 17.1 version 17.1R1 and later versions prior to 17.3R3-S12;
• 17.4 versions prior to 17.4R2-S13, 17.4R3-S5;
• 18.1 versions prior to 18.1R3-S13;
• 18.2 versions prior to 18.2R3-S8;
• 18.3 versions prior to 18.3R3-S5;
• 18.4 versions prior to 18.4R1-S8, 18.4R2-S6, 18.4R3-S6;
• 19.1 versions prior to 19.1R3-S4;
• 19.2 versions prior to 19.2R1-S7, 19.2R3-S1;
• 19.3 versions prior to 19.3R2-S6, 19.3R3-S1;
• 19.4 versions prior to 19.4R1-S4, 19.4R2-S4, 19.4R3-S1;
• 20.1 versions prior to 20.1R2;
• 20.2 versions prior to 20.2R2-S3, 20.2R3;
• 20.3 versions prior to 20.3R2.

This issue does not affect Junos OS versions prior to 17.1R1.

VxLANs must be in use. Refer to VXLAN documentation about VXLAN configurations.

or

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-2022-22226.

The following software releases have been updated to resolve this specific issue: 17.3R3-S12, 17.4R2-S13, 17.4R3-S5, 18.1R3-S13, 18.2R3-S8, 18.3R3-S5, 18.4R1-S8, 18.4R2-S6, 18.4R3-S6, 19.1R3-S4, 19.2R1-S7, 19.2R3-S1, 19.3R2-S6, 19.3R3-S1, 19.4R1-S4, 19.4R2-S4, 19.4R3-S1, 20.1R2, 20.2R2-S3, 20.2R3, 20.3R2, 20.4R1, and all subsequent releases.

This issue is being tracked as PR 1535518 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).

IMPLEMENTATION:

Software Releases, patches and updates are available at https://support.juniper.net/support/downloads/.

• 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-2022-22226 at cve.mitre.org
• https://www.juniper.net/documentation/us/en/software/junos/ovsdb-vxlan/evpn-vxlan/topics/ref/statement/vxlan.html#id-vxlan__d281e31