Junos OS and Junos OS Evolved: Due to a race condition the rpd process can crash upon receipt of a BGP update message containing flow spec route

Summary

A Time-of-check Time-of-use (TOCTOU) Race Condition vulnerability in Routing Protocol Daemon (rpd) of Juniper Networks Junos OS, Junos OS Evolved allows a network-based unauthenticated attacker to cause a Denial of Service (DoS). When a BGP flow route with redirect IP extended community is received, and the reachability to the next-hop of the corresponding redirect IP is flapping, the rpd process might crash. Whether the crash occurs depends on the timing of the internally processing of these two events and is outside the attackers control. Please note that this issue also affects Route-Reflectors unless 'routing-options flow firewall-install-disable' is configured. This issue affects: Juniper Networks Junos OS: 18.4 versions prior to 18.4R2-S10, 18.4R3-S10; 19.1 versions prior to 19.1R3-S7; 19.2 versions prior to 19.2R1-S8, 19.2R3-S4; 19.4 versions prior to 19.4R3-S8; 20.2 versions prior to 20.2R3-S3; 20.3 versions prior to 20.3R3-S2; 20.4 versions prior to 20.4R3; 21.1 versions prior to 21.1R2. Juniper Networks Junos OS Evolved: All versions prior to 20.4R2-EVO; 21.1-EVO versions prior to 21.1R2-EVO. This issue does not affect Juniper Networks Junos OS versions prior to 18.4R1.

Timeline

1. Oct 18, 2022, 2:46 AM UTCCVE published
2. May 12, 2025, 2:43 PM UTCCISA SSVC assessment

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

3. May 12, 2025, 2:43 PM UTCRecord last updated

Affected versions

• Juniper Networks Junos OS

  From 19.1 · fixed in 19.1R3-S7; From 19.4 · fixed in 19.4R3-S8; From 20.2 · fixed in 20.2R3-S3; From 20.3 · fixed in 20.3R3-S2; From 20.4 · fixed in 20.4R3; From 21.1 · fixed in 21.1R2

• Juniper Networks Junos OS Evolved

  fixed in 20.4R2-EVO; From 21.1-EVO · fixed in 21.1R2-EVO

References 1