CVE-2024-39513

/// Technical description

An Improper Input Validation vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS Evolved allows a local, low-privileged attacker to cause a Denial of Service (DoS).

When a specific "clear" command is run, the Advanced Forwarding Toolkit manager (evo-aftmand-bt or evo-aftmand-zx) crashes and restarts.

The crash impacts all traffic going through the FPCs, causing a DoS. Running the command repeatedly leads to a sustained DoS condition.

This issue affects Junos OS Evolved: 

* All versions before 20.4R3-S9-EVO, 

* from 21.2-EVO before 21.2R3-S7-EVO, 

* from 21.3-EVO before 21.3R3-S5-EVO, 

* from 21.4-EVO before 21.4R3-S6-EVO, 

* from 22.1-EVO before 22.1R3-S4-EVO, 

* from 22.2-EVO before 22.2R3-S3-EVO, 

* from 22.3-EVO before 22.3R3-S3-EVO, 

* from 22.4-EVO before 22.4R3-EVO,

* from 23.2-EVO before 23.2R2-EVO.

/// 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