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Medium severity6.5NVD Advisory· Published Jul 9, 2026· Updated Jul 13, 2026

CVE-2026-33803

CVE-2026-33803

Description

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.

Affected products

49
  • Juniper Networks/OS Evolvedllm-fuzzy49 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+ 48 more
    • (no CPE)range: <23.2R2-S7-EVO, <23.4R2-S8-EVO, <24.2R2-S5-EVO, <24.4R2-S4-EVO, <25.2R2-S1-EVO, <25.4R1-S2-EVO
    • cpe:2.3:o:juniper:junos_os_evolved:*:*:*:*:*:*:*:*range: <23.2
    • cpe:2.3:o:juniper:junos_os_evolved:23.2:-:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:23.2:r1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:23.2:r1-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:23.2:r1-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:23.2:r2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:23.2:r2-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:23.2:r2-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:23.2:r2-s3:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:23.2:r2-s4:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:23.2:r2-s5:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:23.2:r2-s6:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:23.4:-:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:23.4:r1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:23.4:r1-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:23.4:r1-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:23.4:r2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:23.4:r2-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:23.4:r2-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:23.4:r2-s3:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:23.4:r2-s4:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:23.4:r2-s5:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:23.4:r2-s6:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:23.4:r2-s7:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:24.2:-:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:24.2:r1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:24.2:r1-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:24.2:r2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:24.2:r2-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:24.2:r2-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:24.2:r2-s3:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:24.2:r2-s4:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:24.4:-:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:24.4:r1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:24.4:r1-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:24.4:r1-s3:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:24.4:r2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:24.4:r2-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:24.4:r2-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:24.4:r2-s3:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:25.2:-:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:25.2:r1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:25.2:r1-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:25.2:r1-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:25.2:r2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:25.4:-:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:25.4:r1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:25.4:r1-s1:*:*:*:*:*:*

Patches

Vulnerability mechanics

References

1

News mentions

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