CVE-2025-52958

/// Technical description

A Reachable Assertion vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an adjacent, unauthenticated attacker to cause a Denial of Service (DoS).On all Junos OS and Junos OS Evolved devices, when route validation is enabled, a rare condition during BGP initial session establishment can lead to an rpd crash and restart. This occurs specifically when the connection request fails during error-handling scenario.

Continued session establishment failures leads to a sustained DoS condition. 

This issue affects Junos OS:

* All versions before 22.2R3-S6,

* from 22.4 before 22.4R3-S6,

* from 23.2 before 23.2R2-S3,

* from 23.4 before 23.4R2-S4,

* from 24.2 before 24.2R2;

Junos OS Evolved:

* All versions before 22.2R3-S6-EVO,

* from 22.4 before 22.4R3-S6-EVO,

* from 23.2 before 23.2R2-S3-EVO,

* from 23.4 before 23.4R2-S4-EVO,

* from 24.2 before 24.2R2-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