An Improper Input Validation vulnerability in Juniper Tunnel Driver (jtd) and ICMP module of Juniper Networks Junos OS Evolved allows an unauthenticated attacker within the MPLS administrative domain to send specifically crafted packets to the Routing Engine (RE) to cause a Denial of Service (DoS). 

When specifically crafted transit MPLS IPv4 packets are received by the Packet Forwarding Engine (PFE), these packets are internally forwarded to the RE. Continued receipt of these packets may create a sustained Denial of Service (DoS) condition.

This issue affects Juniper Networks Junos OS Evolved:

• All versions before 21.2R3-S8-EVO;
• from 21.4-EVO before 21.4R3-S6-EVO;
• from 22.2-EVO before 22.2R3-S4-EVO;
• from 22.3-EVO before 22.3R3-S3-EVO;
• from 22.4-EVO before 22.4R3-EVO;
• from 23.2-EVO before 23.2R2-EVO;
• from 23.4-EVO before 23.4R1-S1-EVO.

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

Junos OS Evolved:21.2R3-S8-EVO, 21.4R3-S6-EVO, 22.2R3-S4-EVO, 22.3R3-S3-EVO, 22.4R3-EVO, 23.2R2-EVO, 23.4R1-EVO, 23.4R1-S1-EVO, 24.1R1-EVO and all subsequent releases.

This issue is being tracked as 1731219 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).

2024-09-13: Minor formatting change to cvss field.
2024-04-10: 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
• https://www.cve.org/CVERecord?id=CVE-2024-21590