Advisory severityCritical9.8Juniper Networks Updated

Critical [CVE-2026-101954] 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

This critical-severity Juniper Networks advisory covers CVE-2026-101954 affecting Junos OS Evolved.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-101954 Source published Oct 15, 2026Source updated Oct 16, 2026

VulniPulse record published Oct 15, 2026Record updated Oct 21, 2026

CVE-2026-101954

Affected products & platforms

Juniper NetworksJunosJunos OS Evolved

Open source advisory

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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 configuration access and take over the device via a reachable J-Web HTTP or HTTPS service when web management is enabled.

Affected versions

Junos OS 25.2 before 25.2R2-S2
Junos OS 25.4 before 25.4R1-S3
Junos OS 26.2 before 26.2R1-S2
Junos OS Evolved 25.2 before 25.2R2-S2-EVO
Junos OS Evolved 25.4 before 25.4R1-S3-EVO
Junos OS Evolved 26.2 before 26.2R1-S2-EVO
Junos OS Evolved 23.4X100
Junos OS Evolved 25.2X100 before 25.2X100-D35-EVO
Junos OS Evolved 25.4X300 before 25.4X300-D40-EVO

Official advisory · high-confidence parse· fetched 7 days ago·verify at source

Fixed versions

25.2R2-S2
25.4R1-S3
26.2R1-S2
25.2R2-S2-EVO
25.4R1-S3-EVO
26.2R1-S2-EVO
25.2X100-D35-EVO
25.4X300-D40-EVO

Official advisory · high-confidence parse· fetched 7 days ago·verify at source

Mitigation

Upgrade to a fixed release: 25.2R2-S2, 25.4R1-S3, 26.2R1-S2, 25.2R2-S2-EVO, 25.4R1-S3-EVO, 26.2R1-S2-EVO. That is the remediation for this advisory.

The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.

Official advisory · high-confidence parse· fetched 7 days ago·verify at source

Sources

Official and corroborating records used to build this advisory.

Official vendor advisoryofficial
Official advisory page fetched and parsed; accepted detail fields are attributed to this page.
Juniper Networks
CVE.org CNA recordCVE.org
Independent CNA record used for near-real-time discovery and missed-CVE reconciliation. Discovered from the machine-readable feed https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/delta.json; this link opens the CVE.org record for CVE-2026-101954 instead of the raw feed document.
CVE Program

Cross-references

Validate CVE metadata against the authoritative registries.

CVE-2026-101954NVD CVE.org MITRE

Official resources

Junos OS software downloads & install/upgrade (target: 25.2R2-S2 / 25.4R1-S3 / 26.2R1-S2)
Official documentation
This advisory names 25.2R2-S2 / 25.4R1-S3 / 26.2R1-S2 as the first fixed releases — official upgrade documentation for Junos OS on SRX / MX / EX / QFX.
Junos OS release & EOL / support dates
Release notes
Confirm your train is still supported and pick a fixed maintenance release.
Juniper Security Advisories portal
Official documentation
Canonical Juniper SIRT advisory portal — search here for the full JSA text and revisions.

Discussion(0)

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