Vulnerability Intelligence Report
Junos OS and Junos OS Evolved: Unauthenticated network access causes full device takeover when J-Web is enabled
CVE-2026-101954
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.
Authentication Bypass
No Active Exploit Signals
CVSS Base Score
9.8
CRITICAL
Exploitability:3.9
Impact Score:5.9
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
—
Authentication
—
Weaponization
—
SSVC Action
—
Weaknesses (CWE)
CWE-287 ↗CWE-287 Improper Authentication
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| Juniper Networks | Junos OS | 25.2 < 25.2R2-S2 (affected), 25.4 < 25.4R1-S3 (affected), 26.2 < 26.2R1-S2 (affected) |
| Juniper Networks | Junos OS Evolved | 25.2 < 25.2R2-S2-EVO (affected), 25.4 < 25.4R1-S3-EVO (affected), 26.2 < 26.2R1-S2-EVO (affected), 23.4X100 (affected), 25.2X100 < 25.2X100-D35-EVO (affected), 25.4X300 < 25.4X300-D40-EVO (affected) |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
GitHub Advisory
Vulnerability Class
Authentication Bypass
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | Juniper Networks, Inc. · Vendor · USA |
| Reserved | 2026-09-28T16:28:35 |
| Published | 2026-10-14T17:22:07 |
| Patch Date | 2026-10-14 |
| Last Updated | 2026-10-14T17:22:07 |
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