An Expired Pointer Dereference vulnerability in Routing Protocol Daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated, adjacent attacker to cause Denial of Service (DoS).

On all Junos OS and Junos OS Evolved platforms, when an MPLS Label-Switched Path (LSP) is configured with node-link-protection and transport-class, and an LSP flaps, rpd crashes and restarts. Continuous flapping of LSP can cause a sustained Denial of Service (DoS) condition.

This issue affects:

Junos OS:

• All versions before 22.2R3-S4,
• 22.4 versions before 22.4R3-S2,
• 23.2 versions before 23.2R2,
• 23.4 versions before 23.4R2.

Junos OS Evolved:

• All versions before 22.2R3-S4-EVO,
• 22.4-EVO versions before 22.4R3-S2-EVO,
• 23.2-EVO versions before 23.2R2-EVO,
• 23.4-EVO versions before 23.4R2-EVO.

For this issue to occur, MPLS LSP needs to be configured with node-link-protection and transport-class. The tunnel needs to be configured with both primary (strict hops) and secondary (partially strict hops) paths.

[ protocols mpls label-switched-path tunnel-<name> node-link-protection ]
[ protocols mpls label-switched-path tunnel-<name> adaptive ]
[ protocols mpls label-switched-path tunnel-<name> primary <route1_name> ]
[ protocols mpls label-switched-path tunnel-<name> secondary <route2_name> ]
[ protocols mpls label-switched-path tunnel-<name> transport-class <name> ]

Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

This issue was seen during production usage.

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

Junos OS: 22.2R3-S4, 22.4R3-S2, 23.2R2, 23.4R2, 24.2R1, and all subsequent releases.

Junos OS Evolved: 22.2R3-S4-EVO, 22.4R3-S2-EVO, 23.2R2-EVO, 23.4R2-EVO, 24.2R1-EVO, and all subsequent releases.

This issue is being tracked as 1788445 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.

2025-04-09: 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