Juniper Junos OS up to 24.2R1 Packet Forwarding Engine length parameter

Summaryinfo

A vulnerability was found in Juniper Junos OS up to 22.2R3-S5/22.4R3-S5/23.2R2-S2/23.4R2-S3/24.2R1. It has been declared as critical. Affected by this vulnerability is an unknown functionality of the component Packet Forwarding Engine. Executing a manipulation can lead to length parameter. This vulnerability is tracked as CVE-2025-30659. The attack can be launched remotely. No exploit exists. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in Juniper Junos OS up to 22.2R3-S5/22.4R3-S5/23.2R2-S2/23.4R2-S3/24.2R1. This vulnerability affects some unknown processing of the component Packet Forwarding Engine. The manipulation with an unknown input leads to a length parameter vulnerability. The CWE definition for the vulnerability is CWE-130. The product parses a formatted message or structure, but it does not handle or incorrectly handles a length field that is inconsistent with the actual length of the associated data. As an impact it is known to affect availability. CVE summarizes:

An Improper Handling of Length Parameter Inconsistency vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS on SRX Series allows an unauthenticated, network-based attacker to cause a Denial-of-Service (DoS). When a device configured for Secure Vector Routing (SVR) receives a specifically malformed packet the PFE will crash and restart. This issue affects Junos OS on SRX Series: * All 21.4 versions, * 22.2 versions before 22.2R3-S6, * 22.4 versions before 22.4R3-S6, * 23.2 versions before 23.2R2-S3, * 23.4 versions before 23.4R2-S4, * 24.2 versions before 24.2R2. This issue does not affect versions before 21.4.

The advisory is available at supportportal.juniper.net. This vulnerability was named CVE-2025-30659 since 03/24/2025. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. The technical details are unknown and an exploit is not available.

The vulnerability scanner Nessus provides a plugin with the ID 234086 (Juniper Junos OS Vulnerability (JSA96470)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 22.2R3-S6, 22.4R3-S6, 23.2R2-S3, 23.4R2-S4 or 24.2R2 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (234086). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

• Router Operating System

Vendor

• Juniper

Name

• Junos OS

Version

• 22.2R3-S5
• 22.4R3-S5
• 23.2R2-S2
• 23.4R2-S3
• 24.2R1

License

• commercial

Website

• Vendor: https://www.juniper.net/

CPE 2.3info

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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