All vulnerabilities
CVE-2026-101954

Junos OS and Junos OS Evolved: Unauthenticated network access causes full device takeover when J-Web is enabled

Juniper Networks Junos OSNetwork & edge
Open in ThreatlineRecord JSON
CVSS
9.8Critical
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.49%Chance of exploitation activity in the next 30 days, higher than 41% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in25.2R2-S2Also 25.4R1-S3, 26.2R1-S2 and 5 moreCVE List
Published14 Oct 2026Updated 16 Oct 2026CVE List

What fixes it

Show all 8 fixed versions
  • 25.2X100-D35-EVOJunos OS EvolvedCVE List
  • 25.4X300-D40-EVOJunos OS EvolvedCVE List

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Description

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.

Text from CVE List

Affected versions 9

  • Junos OSaffected: 25.2 before 25.2R2-S2CVE List
  • Junos OSaffected: 25.4 before 25.4R1-S3CVE List
  • Junos OSaffected: 26.2 before 26.2R1-S2CVE List
  • Junos OS Evolvedaffected: 25.2 before 25.2R2-S2-EVOCVE List
  • Junos OS Evolvedaffected: 25.4 before 25.4R1-S3-EVOCVE List
  • Junos OS Evolvedaffected: 26.2 before 26.2R1-S2-EVOCVE List
  • Junos OS Evolvedaffected: 23.4X100CVE List
  • Junos OS Evolvedaffected: 25.2X100 before 25.2X100-D35-EVOCVE List
  • Junos OS Evolvedaffected: 25.4X300 before 25.4X300-D40-EVOCVE List

References 1