---
id: CVE-2025-59958
title: >-
  An Improper Check for Unusual or Exceptional Conditions vulnerability in the
  Packet Forwarding Engine (PFE) of Juniper Networks Junos OS Evolved on PTX
  Series allows an unauthenticated, network-based attacker to cause impact to
  confident…
summary: >-
  An Improper Check for Unusual or Exceptional Conditions vulnerability in the
  Packet Forwarding Engine (PFE) of Juniper Networks Junos OS Evolved on PTX
  Series allows an unauthenticated, network-based attacker to cause impact to
  confident…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L'
cwe:
  - CWE-754
vendor: juniper
product: junos_os_evolved
affected:
  - junos_os_evolved < 22.4
  - junos_os_evolved = 22.4
  - junos_os_evolved = 23.2
patched:
  - junos_os_evolved 22.4
published: '2025-10-09'
updated: '2026-10-08'
sourceUpdated: '2026-10-08T13:10:00.200'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-59958'
references:
  - url: 'https://supportportal.juniper.net/JSA103147'
    label: sirt@juniper.net
tags:
  - nvd
epss: 0.0028
epssPercentile: 0.18779
ingestedAt: '2026-10-08T13:42:55.041Z'
---

## Overview

An Improper Check for Unusual or Exceptional Conditions vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS Evolved on PTX Series allows an unauthenticated, network-based attacker to cause impact to confidentiality and availability.

When an output firewall filter is configured with one or more terms where the action is 'reject', packets matching these terms are erroneously sent to the Routing Engine (RE) and further processed there. Processing of these packets will consume limited RE resources. Also responses from the RE back to the source of this traffic could reveal confidential information about the affected device.
This issue only applies to firewall filters applied to WAN or revenue interfaces, so not the mgmt or lo0 interface of the routing-engine, nor any input filters.

This issue affects Junos OS Evolved on PTX Series:



  *  all versions before 22.4R3-EVO,
  *  23.2 versions before 23.2R2-EVO.

## Affected

- `junos_os_evolved < 22.4`
- `junos_os_evolved = 22.4`
- `junos_os_evolved = 23.2`

## Remediation

Upgrade past the affected range:

- `junos_os_evolved 22.4`