CVE-2024-39560: Juniper Junos

Medium severity, CVSS 6.5. EPSS: 0.2% chance of exploitation in the next 30 days.

An Improper Handling of Exceptional Conditions vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows a logically adjacent downstream RSVP neighbor to cause kernel memory exhaustion, leading to a kernel crash, resulting in a Denial of Service (DoS). The kernel memory leak and eventual crash will be seen when the downstream RSVP neighbor has a persistent error which will not be corrected. System kernel memory can be monitored through the use of the 'show system kernel memory' command as shown below: user@router> show system kernel memory   Real memory total/reserved: 4130268/ 133344 Kbytes kmem map free: 18014398509110220 Kbytes This issue affects: Junos OS: * All versions before 20.4R3-S9, * All versions of 21.2, * from 21.4 before 21.4R3-S5, * from 22.1 before 22.1R3-S5, * from 22.2 before 22.2R3-S3, * from 22.3 before 22.3R3-S2, * from 22.4 before 22.4R3, * from 23.2 before 23.2R2; Junos OS Evolved: * All versions before 21.4R3-S5-EVO, * from 22.1-EVO before 22.1R3-S5-EVO, * from 22.2-EVO before 22.2R3-S3-EVO, * from 22.3-EVO before 22.3R3-S2-EVO, * from 22.4-EVO before 22.4R3-EVO, * from 23.2-EVO before 23.2R2-EVO.

Affected products

• Juniper Junos: before 20.4 (fixed in 20.4); from 21.2, before 21.3 (fixed in 21.3); version 20.4 only; version 21.4 only; version 22.1 only; version 22.2 only; …
• Juniper Junos OS Evolved: before 21.4 (fixed in 21.4); version 21.4 only; version 22.1 only; version 22.2 only; version 22.3 only; version 22.4 only; …

Published 2024-07-10. Last modified 2026-06-17.