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CVE-2026-33803

Junos OS Evolved: A port which has been inadvertently exposed can be reached by an attacker

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 23.2R2-S7-EVO, 23.4R2-S8-EVO, 24.2R2-S5-EVO, 24.4R2-S4-EVO, 25.2R2-S1-EVO, and 1 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: yes
  • Technical impact: partial

Summary

An Improper Restriction of Communication Channel to Intended Endpoints vulnerability in Juniper Networks Junos OS Evolved allows an unauthenticated, network-based attacker to cause a limited information disclosure and availability impact to the device. Due to a wrong initialization, a process which should only be able to communicate internally within the device can be reached over the network via an open port. This leads to a device being inadvertently exposed and increased CPU cycles spent processing ingress packets. This issue affects Junos OS Evolved: • all versions before 23.2R2-S7-EVO, • 23.4 versions before 23.4R2-S8-EVO, • 24.2 versions before 24.2R2-S5-EVO, • 24.4 versions before 24.4R2-S4-EVO, • 25.2 versions before 25.2R2-S1-EVO, • 25.4 versions before 25.4R1-S2-EVO.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: yes · Technical impact: partial

  3. Record last updated

Affected versions

  • Juniper Networks Junos OS Evolved

    fixed in 23.2R2-S7-EVO; From 23.4 · fixed in 23.4R2-S8-EVO; From 24.2 · fixed in 24.2R2-S5-EVO; From 24.4 · fixed in 24.4R2-S4-EVO; From 25.2 · fixed in 25.2R2-S1-EVO; From 25.4 · fixed in 25.4R1-S2-EVO

References 1

supportportal.juniper.net