CVE-2026-33803Junos OS Evolved: A port which has been inadvertently exposed can be reached by an attacker
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.
Overview
Severity
| Score | Severity | Version | Vector String |
|---|---|---|---|
| 6.9 | MEDIUM | 4.0juniper (CNA) | 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/AU:Y/R:U/RE:M |
| 6.5 | MEDIUM | 3.1juniper (CNA) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L |
Details
- CVE ID
- CVE-2026-33803
- Status
- Analyzed
- Assigner (CNA)
- juniper
- Published
- Jul 9, 2026
- Last modified
- 2026-10-25 17:10 UTC
- Weaknesses
- CWE-923 · Improper Restriction of Communication Channel to Intended Endpoints
Affected Products
As published by the CNA in the CVE record.
Juniper NetworksJunos OS Evolved6 version ranges
- before 23.2R2-S7-EVO
- 23.4 before 23.4R2-S8-EVO
- 24.2 before 24.2R2-S5-EVO
- 24.4 before 24.4R2-S4-EVO
- 25.2 before 25.2R2-S1-EVO
- 25.4 before 25.4R1-S2-EVO