CVE-2024-21591

/// Technical description

An Out-of-bounds Write vulnerability in J-Web of Juniper Networks Junos OS on SRX Series and EX Series allows an unauthenticated, network-based attacker to cause a Denial of Service (DoS), or Remote Code Execution (RCE) and obtain root privileges on the device.

This issue is caused by use of an insecure function allowing an attacker to overwrite arbitrary memory.

This issue affects Juniper Networks Junos OS SRX Series and EX Series:

* Junos OS versions earlier than 20.4R3-S9;

* Junos OS 21.2 versions earlier than 21.2R3-S7;

* Junos OS 21.3 versions earlier than 21.3R3-S5;

* Junos OS 21.4 versions earlier than 21.4R3-S5;

* Junos OS 22.1 versions earlier than 22.1R3-S4;

* Junos OS 22.2 versions earlier than 22.2R3-S3;

* Junos OS 22.3 versions earlier than 22.3R3-S2;

* Junos OS 22.4 versions earlier than 22.4R2-S2, 22.4R3.

/// 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