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CVE-2026-101986

Junos OS and Junos OS Evolved: J-Web permits pre-authentication CGI execution

Published
Last modified
Status
published
Known exploitation
Not listed in CISA KEV
Fix
Fixed in 23.2R2-S7.7, 23.4R2-S8.13, 24.2R2-S5.5, 24.4R2-S5, 25.2R2-S2, and 11 more
Public exploit
None on Exploit-DB
CISA SSVC
  • Exploitation: none
  • Automatable: yes
  • Technical impact: total
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Decision points from CISA's Vulnrichment, assessed (SSVC 2.0.3).

SSVC documentation

Summary

An Improper Authentication vulnerability in J-Web of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated network attacker to bypass J-Web authentication and execute CGI content with elevated privileges via a crafted HTTP request.

Affected versions

  • Juniper Networks Junos OS

    fixed in 23.2R2-S7.7; From 23.4 · fixed in 23.4R2-S8.13; From 24.2 · fixed in 24.2R2-S5.5; From 24.4 · fixed in 24.4R2-S5; From 25.2 · fixed in 25.2R2-S2; From 25.4 · fixed in 25.4R1-S3; From 26.2 · fixed in 26.2R1-S2

  • Juniper Networks Junos OS Evolved

    fixed in 23.2R2-S7.7-EVO; From 23.4 · fixed in 23.4R2-S8.11-EVO; From 24.2 · fixed in 24.2R2-S5.6-EVO; From 24.4 · fixed in 24.4R2-S5-EVO; From 25.2 · fixed in 25.2R2-S2-EVO; From 25.4 · fixed in 25.4R1-S3-EVO; From 26.2 · fixed in 26.2R1-S2-EVO; From 25.2X100 · fixed in 25.2X100-D35-EVO; From 25.4X300 · fixed in 25.4X300-D40-EVO

References 1

supportportal.juniper.net