A Reachable Assertion vulnerability in the Routing Protocol Daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated, network-based attacker to cause a Denial of Service (DoS).

When the device receives a specific BGP UPDATE packet, the rpd crashes and restarts. Continuous receipt of this specific packet will cause a sustained DoS condition.

For the issue to occur, BGP multipath with "pause-computation-during-churn" must be configured on the device, and the attacker must send the paths via a BGP UPDATE from a established BGP peer.

This issue affects:
Junos OS:

• All versions before 21.4R3-S7,
• from 22.3 before 22.3R3-S3,
• from 22.4 before 22.4R3-S5,
• from 23.2 before 23.2R2,
• from 23.4 before 23.4R2.

Junos OS Evolved:

• All versions before 21.4R3-S7-EVO,
• from 22.3 before 22.3R3-S3-EVO,
• from 22.4 before 22.4R3-S5-EVO,
• from 23.2 before 23.2R2-EVO,
• from 23.4 before 23.4R2-EVO.

Required configuration for exposure:

A sample BGP multipath configuration is shown below:
[ protocols bgp group <name> multipath ]

Required config command:
[ pause-computation-during-churn ]

The following software releases have been updated to resolve this specific issue:
Junos OS: 21.4R3-S7, 22.3R3-S3, 22.4R3-S5, 23.2R2, 23.4R2, 24.2R1, and all subsequent releases.
Junos OS Evolved: 21.4R3-S7-EVO, 22.3R3-S3-EVO, 22.4R3-S5-EVO, 23.2R2-EVO, 23.4R2-EVO, 24.2R1-EVO, and all subsequent releases.

This issue is being tracked as 1766960 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).

This issue can be mitigated by disabling the multipath computation pause command "pause-computation-during-churn".

2025-07-09: 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
• https://www.cve.org/CVERecord?id=CVE-2025-52964