Vulnerability record · CVE-2026-33803 · published 9 July 2026

CVE-2026-33803: Juniper junos os evolved vulnerability

Juniper · Junos Os Evolved

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.

6.9 CVSS 4.0 Medium EPSS 0.35% · top 73.5% CWE-923 · CWE-923

6.9CVSS 4.0 base score

0.35%EPSS exploitation probability, 30 days

NoNot in CISA KEV

1Affected product versions listed by NVD

1References

13 Jul 2026Last modified by NVD

Description

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

Junos Os Evolved Juniper

References

Link	Tags
https://supportportal.juniper.net/JSA110078	Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

10.0CVE-2021-0211Juniper junos vulnerabilityAn improper check for unusual or exceptional conditions in Juniper Networks Junos OS and Junos OS Evolved Routing Protocol Daemon (RPD) service allow…EPSS 1.3%15 Jan 2021 9.3CVE-2026-21902Juniper junos os evolved incorrect permission assignment vulnerabilityAn Incorrect Permission Assignment for Critical Resource vulnerability in the On-Box Anomaly detection framework of Juniper Networks Junos OS Evolved…EPSS 18%25 Feb 2026 8.8CVE-2023-44182Juniper junos unchecked return value vulnerabilityAn Unchecked Return Value vulnerability in the user interfaces to the Juniper Networks Junos OS and Junos OS Evolved, the CLI, the XML API, the XML M…EPSS 0.58%13 Oct 2023 8.8CVE-2023-28983Juniper junos os evolved os command injection vulnerabilityAn OS Command Injection vulnerability in gRPC Network Operations Interface (gNOI) server module of Juniper Networks Junos OS Evolved allows an authen…EPSS 1.5%17 Apr 2023 8.8CVE-2022-22239Juniper junos os evolved execution with unnecessary privileges vulnerabilityAn Execution with Unnecessary Privileges vulnerability in Management Daemon (mgd) of Juniper Networks Junos OS Evolved allows a locally authenticated…EPSS 0.18%18 Oct 2022 8.8CVE-2021-31350Juniper junos improper privilege management vulnerabilityAn Improper Privilege Management vulnerability in the gRPC framework, used by the Juniper Extension Toolkit (JET) API on Juniper Networks Junos OS an…EPSS 0.87%19 Oct 2021 8.8CVE-2021-31354Juniper junos out-of-bounds read vulnerabilityAn Out Of Bounds (OOB) access vulnerability in the handling of responses by a Juniper Agile License (JAL) Client in Juniper Networks Junos OS and Jun…EPSS 0.63%19 Oct 2021 8.8CVE-2021-0208Juniper junos improper input validation vulnerabilityAn improper input validation vulnerability in the Routing Protocol Daemon (RPD) service of Juniper Networks Junos OS allows an attacker to send a mal…EPSS 0.65%15 Jan 2021

Source: NIST National Vulnerability Database (record CVE-2026-33803), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.