CVE-2023-44204

/// Technical description

An Improper Validation of Syntactic Correctness of Input vulnerability in Routing Protocol Daemon (rpd) Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated, network based attacker to cause a Denial of Service (DoS).

When a malformed BGP UPDATE packet is received over an established BGP session, the rpd crashes and restarts.

This issue affects both eBGP and iBGP implementations.

This issue affects:

Juniper Networks Junos OS

* 21.4 versions prior to 21.4R3-S4;

* 22.1 versions prior to 22.1R3-S3;

* 22.2 versions prior to 22.2R3-S2;

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

* 22.4 versions prior to 22.4R2-S1, 22.4R3;

* 23.2 versions prior to 23.2R1, 23.2R2;

Juniper Networks Junos OS Evolved

* 21.4 versions prior to 21.4R3-S5-EVO;

* 22.1 versions prior to 22.1R3-S3-EVO;

* 22.2 versions prior to 22.2R3-S3-EVO;

* 22.3 versions prior to 22.3R2-S2-EVO;

* 22.4 versions prior to 22.4R3-EVO;

* 23.2 versions prior to 23.2R2-E

/// 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