---
id: CVE-2026-101954
title: >-
  An Improper Authentication vulnerability in the J-Web management interface and
  its NETCONF session handling of Juniper Networks Junos OS and Junos OS Evolved
  allows an unauthenticated network attacker to obtain root-level device
  configur…
summary: >-
  An Improper Authentication vulnerability in the J-Web management interface and
  its NETCONF session handling of Juniper Networks Junos OS and Junos OS Evolved
  allows an unauthenticated network attacker to obtain root-level device
  configur…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-287
vendor: Juniper Networks
product: Junos OS
affected:
  - junos_os >= 25.2 < 25.2R2-S2
  - junos_os >= 25.4 < 25.4R1-S3
  - junos_os >= 26.2 < 26.2R1-S2
  - junos_os_evolved >= 25.2 < 25.2R2-S2-EVO
  - junos_os_evolved >= 25.4 < 25.4R1-S3-EVO
  - junos_os_evolved >= 26.2 < 26.2R1-S2-EVO
  - junos_os_evolved 23.4X100
  - junos_os_evolved >= 25.2X100 < 25.2X100-D35-EVO
  - junos_os_evolved >= 25.4X300 < 25.4X300-D40-EVO
published: '2026-10-14'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T15:16:59.280'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-101954'
references:
  - url: 'https://supportportal.juniper.net/JSA112187'
    label: sirt@juniper.net
tags:
  - nvd
  - cve.org
epss: 0.00477
epssPercentile: 0.41023
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-10-16T03:56:49.579626Z'
ingestedAt: '2026-10-14T18:47:39.301Z'
---

## Overview

An Improper Authentication vulnerability in the J-Web management interface and its NETCONF session handling of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated network attacker to obtain root-level device configuration access and take over the device via a reachable J-Web HTTP or HTTPS service when web management is enabled.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.