Junos OS and Junos OS Evolved: A link flap causes patroot memory leak which leads to rpd crash

Summary

A Missing Release of Memory after Effective Lifetime vulnerability in Routing Protocol Daemon (RPD) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated, adjacent attacker to cause an rpd crash, leading to Denial of Service (DoS). On all Junos OS and Junos OS Evolved platforms, when traffic engineering is enabled for OSPF or ISIS, and a link flaps, a patroot memory leak is observed. This memory leak, over time, will lead to an rpd crash and restart. The memory usage can be monitored using the below command. user@host> show task memory detail | match patroot This issue affects: Juniper Networks Junos OS • All versions earlier than 21.2R3-S3; • 21.3 versions earlier than 21.3R3-S5; • 21.4 versions earlier than 21.4R3-S3; • 22.1 versions earlier than 22.1R3; • 22.2 versions earlier than 22.2R3. Juniper Networks Junos OS Evolved • All versions earlier than 21.3R3-S5-EVO; • 21.4 versions earlier than 21.4R3-EVO; • 22.1 versions earlier than 22.1R3-EVO; • 22.2 versions earlier than 22.2R3-EVO.

Timeline

1. Jan 12, 2024, 12:55 AM UTCCVE published
2. Jan 12, 2024, 3:44 PM UTCCISA SSVC assessment

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

3. Jun 17, 2025, 9:09 PM UTCRecord last updated

Affected versions

• Juniper Networks Junos OS

  fixed in 21.2R3-S3; From 21.3 · fixed in 21.3R3-S5; From 21.4 · fixed in 21.4R3-S3; From 22.1 · fixed in 22.1R3; From 22.2 · fixed in 22.2R3

• Juniper Networks Junos OS Evolved

  fixed in 21.3R3-S5-EVO; From 21.4 · fixed in 21.4R3-EVO; From 22.1 · fixed in 22.1R3-EVO; From 22.2 · fixed in 22.2R3-EVO

References 2