Juniper Junos OS up to 23.2R2-S6/23.4R2-S7/24.2R2-S4/24.4R1 Packet Forwarding Engine denial of service

Summaryinfo

A vulnerability categorized as critical has been discovered in Juniper Junos OS up to 23.2R2-S6/23.4R2-S7/24.2R2-S4/24.4R1. The affected element is an unknown function of the component Packet Forwarding Engine. Executing a manipulation can lead to denial of service. This vulnerability is registered as CVE-2026-57032. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability was found in Juniper Junos OS up to 23.2R2-S6/23.4R2-S7/24.2R2-S4/24.4R1. It has been declared as critical. This vulnerability affects an unknown functionality of the component Packet Forwarding Engine. The manipulation with an unknown input leads to a denial of service vulnerability. The CWE definition for the vulnerability is CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. As an impact it is known to affect availability. CVE summarizes:

An Improper Handling of Undefined Parameters vulnerability in the packet forwarding engine (pfe) of Juniper Networks Junos OS on EX Series devices allows an authenticated attacker with low privileges to cause a Denial-of-Service (DoS). If an attempt is made to subscribe to an unsupported telemetry sensor path on EX2300, EX3400, EX4000, EX4100 and EX4400 via gRPC, this causes the FPC to crash. This leads to a complete service outage until the module has automatically restarted.  The following log message can be seen when this issue happens: agentd[<PID>]: AGENTD_RESOURCE_NOT_FOUND: No resource name found for <sensor> This issue affects Junos OS on EX2300, EX3400, EX4000, EX4100 and EX4400 devices: * all versions before 23.2R2-S7, * 23.4 versions before 23.4R2-S8, * 24.2 versions before 24.2R2-S5, * 24.4 versions before 24.4R2.

The advisory is available at supportportal.juniper.net. This vulnerability was named CVE-2026-57032 since 06/23/2026. The exploitation appears to be easy. The attack can be initiated remotely. Successful exploitation requires user interaction by the victim. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 07/10/2026). This vulnerability is assigned to T1499 by the MITRE ATT&CK project.

Upgrading to version 23.2R2-S7, 23.4R2-S8, 24.2R2-S5 or 24.4R2 eliminates this vulnerability.

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Productinfo

Type

• Router Operating System

Vendor

• Juniper

Name

• Junos OS

Version

• 23.2R2-S6
• 23.4R2-S7
• 24.2R2-S4
• 24.4R1

License

• commercial

Website

• Vendor: https://www.juniper.net/

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