All vulnerabilities
CVE-2026-101956

Junos OS: Unauthorized root command execution 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)0.75%Chance of exploitation activity in the next 30 days, higher than 54% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in25.2R2-S2Also 25.4R1-S3, 26.2R1-S2CVE List
Published14 Oct 2026Updated 15 Oct 2026CVE List

What fixes it

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 web management component of Juniper Networks Junos OS allows an unauthenticated remote attacker to execute arbitrary Junos commands with root privileges via the exposed J-Web web interface.

Text from CVE List

Affected versions 3

  • 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

References 1