CVE-2025-30651

Technical Description

A Buffer Access with Incorrect Length Value vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated, network-based attacker to cause a Denial of Service (DoS).

When an attacker sends a specific ICMPv6 packet to an interface with "protocols router-advertisement" configured, rpd crashes and restarts. Continued receipt of this packet will cause a sustained DoS condition. 

This issue only affects systems configured with IPv6.

This issue affects Junos OS: 

* All versions before 21.2R3-S9, 

* from 21.4 before 21.4R3-S10,

* from 22.2 before 22.2R3-S6,

* from 22.4 before 22.4R3-S4,

* from 23.2 before 23.2R2-S2,

* from 23.4 before 23.4R2;

and Junos OS Evolved:

* All versions before 21.2R3-S9-EVO,

* from 21.4-EVO before 21.4R3-S10-EVO,

* from 22.2-EVO before 22.2R3-S6-EVO,

* from 22.4-EVO before 22.4R3-S4-EVO,

* from 23.2-EVO before 23.2R2-S2-EVO,

* from 23.4-EVO befo

Remediation

Check the references section for vendor advisories and patches from juniper. Update junos to the latest patched version. 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.

Affected Products

References