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Medium6.5Juniper Networks

Medium [CVE-2026-33803] 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

This medium-severity Juniper Networks advisory covers CVE-2026-33803 affecting Junos OS Evolved, Junos OS, Junos.

CVE-2026-33803 Published Jul 9, 2026Updated by vendor Jul 13, 2026
CVE-2026-33803
Affected products & platforms
Juniper NetworksJunosJunos OS Evolved
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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,
Affected versions
  • * all versions before 23

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Fixed versions
  • 23.2R2-S7-EVO
  • 23.4R2-S8-EVO
  • 24.2R2-S5-EVO
  • 24.4R2-S4-EVO
  • 25.2R2-S1-EVO
  • 25.4R1-S2-EVO

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Mitigation

Upgrade to a fixed release: 23.2R2-S7-EVO, 23.4R2-S8-EVO, 24.2R2-S5-EVO, 24.4R2-S4-EVO, 25.2R2-S1-EVO, 25.4R1-S2-EVO. That is the remediation for this advisory.

The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

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