Junos OS and Junos OS Evolved: Receipt of a specific BGP UPDATE causes an rpd crash on devices with BGP multipath configured

Summary

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.

Timeline

1. Jul 11, 2025, 3:06 PM UTCCVE published
2. Jul 14, 2025, 4:35 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: yes · Technical impact: partial

3. Jul 14, 2025, 4:35 PM UTCRecord last updated

Affected versions

• Juniper Networks Junos OS

  fixed in 21.4R3-S7; From 22.3 · fixed in 22.3R3-S3; From 22.4 · fixed in 22.4R3-S5; From 23.2 · fixed in 23.2R2; From 23.4 · fixed in 23.4R2; From 22.1; From 22.2

• Juniper Networks Junos OS Evolved

  fixed in 21.4R3-S7-EVO; From 22.3 · fixed in 22.3R3-S3-EVO; From 22.4 · fixed in 22.4R3-S5-EVO; From 23.2 · fixed in 23.2R2-EVO; From 23.4 · fixed in 23.4R2-EVO

References 1