by Kastro CVE-2026-101954
Juniper Networks Junos OS — Junos OS and Junos OS Evolved: Unauthenticated network access causes full device takeover when J-Web is enabled
Description · from the CVE record
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
ProductAffectedFixed inSource
Junos OS25.2 – < 25.2R2-S225.2R2-S2CNA
Junos OS25.4 – < 25.4R1-S325.4R1-S3CNA
Junos OS26.2 – < 26.2R1-S226.2R1-S2CNA
Junos OS Evolved25.2 – < 25.2R2-S2-EVO25.2R2-S2-EVOCNA
Junos OS Evolved25.4 – < 25.4R1-S3-EVO25.4R1-S3-EVOCNA
Junos OS Evolved26.2 – < 26.2R1-S2-EVO26.2R1-S2-EVOCNA
Junos OS Evolved23.4X100–CNA
Junos OS Evolved25.2X100 – < 25.2X100-D35-EVO25.2X100-D35-EVOCNA
Junos OS Evolved25.4X300 – < 25.4X300-D40-EVO25.4X300-D40-EVOCNA
Scores by source
juniper (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
juniper (CNA)9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:L
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total