Unauth Network Impact: Junos PTX Before 22.4R3 Reject Action Firewall Filter Bug
CVE-2025-59958 Published on October 9, 2025
Junos OS Evolved: PTX Series: When a firewall filter rejects traffic these packets are erroneously sent to the RE
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.
Vulnerability Analysis
CVE-2025-59958 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a small impact on confidentiality, a small impact on integrity, and a small impact on availability.
Weakness Type
Improper Check for Unusual or Exceptional Conditions
The software does not check or incorrectly checks for unusual or exceptional conditions that are not expected to occur frequently during day to day operation of the software.
Products Associated with CVE-2025-59958
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Affected Versions
Juniper Networks Junos OS Evolved:- Before 22.4R3-EVO is affected.
- Version 23.2 and below 23.2R2-EVO is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.