Junos OS and Junos OS Evolved: When route validation is enabled, BGP connection establishment failure causes RPD crash

Summary

A Reachable Assertion vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an adjacent, unauthenticated attacker to cause a Denial of Service (DoS).On all Junos OS and Junos OS Evolved devices, when route validation is enabled, a rare condition during BGP initial session establishment can lead to an rpd crash and restart. This occurs specifically when the connection request fails during error-handling scenario. Continued session establishment failures leads to a sustained DoS condition.  This issue affects Junos OS: • All versions before 22.2R3-S6, • from 22.4 before 22.4R3-S6, • from 23.2 before 23.2R2-S3, • from 23.4 before 23.4R2-S4, • from 24.2 before 24.2R2; Junos OS Evolved: • All versions before 22.2R3-S6-EVO, • from 22.4 before 22.4R3-S6-EVO, • from 23.2 before 23.2R2-S3-EVO, • from 23.4 before 23.4R2-S4-EVO, • from 24.2 before 24.2R2-EVO.

Timeline

1. Jul 11, 2025, 2:43 PM UTCCVE published
2. Jul 11, 2025, 2:55 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: partial

3. Jul 11, 2025, 2:55 PM UTCRecord last updated

Affected versions

• Juniper Networks Junos OS

  fixed in 22.2R3-S6; From 22.4 · fixed in 22.4R3-S6; From 23.2 · fixed in 23.2R2-S3; From 23.4 · fixed in 23.4R2-S4; From 24.2 · fixed in 24.2R2

• Juniper Networks Junos OS Evolved

  fixed in 22.2R3-S6-EVO; From 22.4 · fixed in 22.4R3-S6-EVO; From 23.2 · fixed in 23.2R2-S3-EVO; From 23.4 · fixed in 23.4R2-S4-EVO; From 24.2 · fixed in 24.2R2-EVO

References 1