An Allocation of Resources Without Limits or Throttling vulnerability in the kernel of Juniper Networks Junos OS Evolved allows an unauthenticated, network-based attacker to cause a Denial of Service (DoS).

If a high rate of specific valid packets are processed by the routing engine (RE) this will lead to a loss of connectivity of the RE with other components of the chassis and thereby a complete and persistent system outage. Please note that a carefully designed lo0 firewall filter will block or limit these packets which should prevent this issue from occurring.

The following log messages can be seen when this issue occurs:

<host> kernel: nf_conntrack: nf_conntrack: table full, dropping packet
This issue affects Juniper Networks Junos OS Evolved:



* All versions earlier than 20.4R3-S7-EVO;
* 21.2R1-EVO and later versions;
* 21.4-EVO versions earlier than 21.4R3-S5-EVO;
* 22.1-EVO versions earlier than 22.1R3-S2-EVO;
* 22.2-EVO versions earlier than 22.2R3-EVO;
* 22.3-EVO versions earlier than 22.3R2-EVO;
* 22.4-EVO versions earlier than 22.4R2-EVO.






Fixes

Solution

The following software releases have been updated to resolve this specific issue: Junos OS Evolved 20.4R3-S7-EVO, 21.4R3-S5-EVO, 22.1R3-S2-EVO, 22.2R3-EVO, 22.3R2-EVO, 22.4R2-EVO, 23.2R1-EVO, and all subsequent releases.


Workaround

To prevent the device from receiving high rates of valid traffic please configure firewall filters to block unexpected and even throttle expected traffic.

History

Tue, 03 Jun 2025 14:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


cve-icon MITRE

Status: PUBLISHED

Assigner: juniper

Published:

Updated: 2025-06-03T14:05:41.706Z

Reserved: 2023-12-27T19:38:25.707Z

Link: CVE-2024-21604

cve-icon Vulnrichment

Updated: 2024-08-01T22:27:35.509Z

cve-icon NVD

Status : Modified

Published: 2024-01-12T01:15:48.677

Modified: 2024-11-21T08:54:42.177

Link: CVE-2024-21604

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.