CVE-2023-44191

/// Technical description

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

On all Junos OS QFX5000 Series and EX4000 Series platforms, when a high number of VLANs are configured, a specific DHCP packet will cause PFE hogging which will lead to dropping of socket connections.

This issue affects:

Juniper Networks Junos OS on QFX5000 Series and EX4000 Series

* 21.1 versions prior to 21.1R3-S5;

* 21.2 versions prior to 21.2R3-S5;

* 21.3 versions prior to 21.3R3-S5;

* 21.4 versions prior to 21.4R3-S4;

* 22.1 versions prior to 22.1R3-S3;

* 22.2 versions prior to 22.2R3-S1;

* 22.3 versions prior to 22.3R2-S2, 22.3R3;

* 22.4 versions prior to 22.4R2.

This issue does not affect Juniper Networks Junos OS versions prior to 21.1R1

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References