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CVE-2026-33803

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

MEDIUM
6.5
CVSS Score
Published: July 9, 2026 at 09:04 PM UTC
Updated: October 25, 2026 at 05:10 PM UTC
2 products affected across 2 vendorsJunos OS EvolvedJunos OS Evolved

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Severity
MEDIUM6.5
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Junos OS Evolved· Juniper
95%
v < 23.223.223.2 r123.2 r1-s123.2 r1-s223.2 r223.2 r2-s123.2 r2-s223.2 r2-s323.2 r2-s423.2 r2-s523.2 r2-s623.423.4 r123.4 r1-s123.4 r1-s223.4 r223.4 r2-s123.4 r2-s223.4 r2-s323.4 r2-s423.4 r2-s523.4 r2-s623.4 r2-s724.224.2 r124.2 r1-s224.2 r224.2 r2-s124.2 r2-s224.2 r2-s324.2 r2-s424.424.4 r124.4 r1-s224.4 r1-s324.4 r224.4 r2-s124.4 r2-s224.4 r2-s325.225.2 r125.2 r1-s125.2 r1-s225.2 r225.425.4 r125.4 r1-s1
Affected range stops below 23.2, so it looks safe — our inference, not a vendor statement
Junos OS Evolved· Juniper Networks
90%
v < 23.2R2-S7-EVO23.4 ≤ v < 23.4R2-S8-EVO24.2 ≤ v < 24.2R2-S5-EVO24.4 ≤ v < 24.4R2-S4-EVO25.2 ≤ v < 25.2R2-S1-EVO25.4 ≤ v < 25.4R1-S2-EVO23.424.224.425.225.4
Affected range stops below 23.2R2-S7-EVO, so it looks safe — our inference, not a vendor statement
Affected range stops below 23.4R2-S8-EVO, so it looks safe — our inference, not a vendor statement
Affected range stops below 24.2R2-S5-EVO, so it looks safe — our inference, not a vendor statement
Affected range stops below 24.4R2-S4-EVO, so it looks safe — our inference, not a vendor statement
Affected range stops below 25.2R2-S1-EVO, so it looks safe — our inference, not a vendor statement
Affected range stops below 25.4R1-S2-EVO, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor Advisory
Source: cverecord
https://supportportal.juniper.net/JSA110078

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.5MEDIUMjuniper
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
LOW
Vector?

Quick Info

StatusANALYZED
CWE
CWE-923

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